.270 vs .280
- Thread starter BIGREDD
- Start date
senior
#### that is corny, I sounded like Mr. Dressup
Longer bullets have a higher B.C., and retain velocity and energy at longer range. That being said, some 140 gr. 7mm ballistic tip typed boat tailed bullets have just as high of B.C. as a 140 gr. 6.5mm spitzers nowadays. :?
tb
Shoot what you want, for me it's a 260 Remington.
I'm bored, here's a comparison between the 260 Rem, 270 Win, and 280 Rem, using Nosler Partition bullets at factory claimed velocities, using their most popular bullet weights.
260 Rem 140 gr. Nosler Partition @ 2750 fps Recoil in 8lb rifle = 14 ft-lbs
+/- 3" Point Blank Range of 275 yards ~ 233 yard zero
100 yards ~ +2.7", 2575 fps, 2060 ft-lbs, 0.7" wind drift (10 mph crosswind)
200 yards ~ +1.6", 2405 fps, 1800 ft-lbs, 2.7" wind drift
300 yards ~ -5.5", 2245 fps, 1570 ft-lbs, 6.2" wind drift
400 yards ~ -19.4", 2090 fps, 1360 ft-lbs, 11.4" wind drift
500 yards ~ -41.4", 1940 fps, 1170 ft-lbs, 18.4" wind drift
270 Win 130 gr. Nosler Partition @ 3060 fps Recoil in 8.5 lb rifle = 19 ft-lbs
+/- 3" Point Blank Range of 299 yards ~ 254 yard zero
100 yards ~ +2.5", 2840 fps, 2325 ft-lbs, 0.7" wind drift (10 mph crosswind)
200 yards ~ +2.2", 2630 fps, 1995 ft-lbs, 2.7" wind drift
300 yards ~ -3.1", 2430 fps, 1705 ft-lbs, 6.4" wind drift
400 yards ~ -14.4", 2240 fps, 1445ft-lbs, 11.8" wind drift
500 yards ~ -32.6", 2055 fps, 1220 ft-lbs, 19.1" wind drift
280 Rem 140 gr. Nosler Partition @ 3000 fps Recoil in 8.5 lb rifle = 19 ft-lbs
+/- 3" Point Blank Range of 295 yards ~ 251 yard zero
100 yards ~ +2.6", 2790 fps, 2420 ft-lbs, 0.7" wind drift (10 mph crosswind)
200 yards ~ +2.2", 2590 fps, 2090 ft-lbs, 2.7" wind drift
300 yards ~ -3.4", 2400 fps, 1795 ft-lbs, 6.3" wind drift
400 yards ~ -15.1", 2220 fps, 1535ft-lbs, 11.5" wind drift
500 yards ~ -33.8", 2045 fps, 1300 ft-lbs, 18.7" wind drift
~
The only advantage I see a 270/280 having over a 260 is for shooting bigger critters at longer ranges. On deer size game I would doubt you'd ever notice a difference. In my limited experience, I have noted my 260's with 140 gr. bullets kill deer just as fast as my ol 7mm Rem Mag did.
Like an old friend, you can always count on sectional density.
#### that is corny, I sounded like Mr. Dressup
Longer bullets have a higher B.C., and retain velocity and energy at longer range. That being said, some 140 gr. 7mm ballistic tip typed boat tailed bullets have just as high of B.C. as a 140 gr. 6.5mm spitzers nowadays. :?
tb
Shoot what you want, for me it's a 260 Remington.
I'm bored, here's a comparison between the 260 Rem, 270 Win, and 280 Rem, using Nosler Partition bullets at factory claimed velocities, using their most popular bullet weights.
260 Rem 140 gr. Nosler Partition @ 2750 fps Recoil in 8lb rifle = 14 ft-lbs
+/- 3" Point Blank Range of 275 yards ~ 233 yard zero
100 yards ~ +2.7", 2575 fps, 2060 ft-lbs, 0.7" wind drift (10 mph crosswind)
200 yards ~ +1.6", 2405 fps, 1800 ft-lbs, 2.7" wind drift
300 yards ~ -5.5", 2245 fps, 1570 ft-lbs, 6.2" wind drift
400 yards ~ -19.4", 2090 fps, 1360 ft-lbs, 11.4" wind drift
500 yards ~ -41.4", 1940 fps, 1170 ft-lbs, 18.4" wind drift
270 Win 130 gr. Nosler Partition @ 3060 fps Recoil in 8.5 lb rifle = 19 ft-lbs
+/- 3" Point Blank Range of 299 yards ~ 254 yard zero
100 yards ~ +2.5", 2840 fps, 2325 ft-lbs, 0.7" wind drift (10 mph crosswind)
200 yards ~ +2.2", 2630 fps, 1995 ft-lbs, 2.7" wind drift
300 yards ~ -3.1", 2430 fps, 1705 ft-lbs, 6.4" wind drift
400 yards ~ -14.4", 2240 fps, 1445ft-lbs, 11.8" wind drift
500 yards ~ -32.6", 2055 fps, 1220 ft-lbs, 19.1" wind drift
280 Rem 140 gr. Nosler Partition @ 3000 fps Recoil in 8.5 lb rifle = 19 ft-lbs
+/- 3" Point Blank Range of 295 yards ~ 251 yard zero
100 yards ~ +2.6", 2790 fps, 2420 ft-lbs, 0.7" wind drift (10 mph crosswind)
200 yards ~ +2.2", 2590 fps, 2090 ft-lbs, 2.7" wind drift
300 yards ~ -3.4", 2400 fps, 1795 ft-lbs, 6.3" wind drift
400 yards ~ -15.1", 2220 fps, 1535ft-lbs, 11.5" wind drift
500 yards ~ -33.8", 2045 fps, 1300 ft-lbs, 18.7" wind drift
~
The only advantage I see a 270/280 having over a 260 is for shooting bigger critters at longer ranges. On deer size game I would doubt you'd ever notice a difference. In my limited experience, I have noted my 260's with 140 gr. bullets kill deer just as fast as my ol 7mm Rem Mag did.
Chilly Willy said:
Until you shoot it over a chrony!!
I'd much prefer a 270 Winchester or 280 Remington to a 7mm Remington Magnum. And I used a 7mm Mag for my first 5 hunting seasons, and shot around 15 head of game with it. It's not all it's cracked up to be in my eyes.
Chilly Willy said:
The .280 appeared because Remington wanted a cartridge that was similar in performance to the .270, but had lower pressure.
They wanted lower pressure because thier Jamomatics were not as strong as a traditional bolt action, and the .280 was originally intended for these semi rifles...
The shoulder of the .280 is moved forward a little bit, because it became apparent that a enthusiastic fellow could chmaber a .280 round in a .270. Just like what happened with the 7WSM recently...
Of course, the 7mm-06 had been around long before this, as a Wildcat.
Apparently Ackley never did a .280 AI, but he did do a 7mm-06 AI.
As for any difference between the two when properly loaded? Pretty much jack ####. There is plenty of bullet selection for both, to do all you ever would want to do with a .277-.284 caliber buyllet...
Anybody got a ballistic program/calculator :?: :?: ...I would really like to see the numbers "energy, velocity and drop" for all three of those cartridges using 140 grain accubonds "max loads for each" using the same 100 yard zero :shock: :idea:
todbartell said:Chilly Willy said:
Until you shoot it over a chrony!!
I'd much prefer a 270 Winchester or 280 Remington to a 7mm Remington Magnum. And I used a 7mm Mag for my first 5 hunting seasons, and shot around 15 head of game with it. It's not all it's cracked up to be in my eyes.
The 7RM doesn't start to really show it's stuff until you go to heavier bullets..
Using 140gr bullets, you may as well be using a 270-280.
The original loadings of the 7RM were pretty hot, as I understaqnd it. Somehting like 3200fps with a 175gr bullet :shock:
My 175gr loads for the 7RM are around 2950fps, chronoed 15 feet form the muzzle.
The 140gr loads are about 3150fps, and I am sure that can be attained by a 280, or close to it...
I stop when I get good accuracy though. Perhaps i could squeeze another 150 fps out of the 140gr loads, by switchig powders but was already over the book max load with H4831SC, and i had excellent accuracy...
Of the 4 7 Rem Mags I've shot over my chrony, not one has lived up to published velocity (with book loads). Most in fact simply gave 280 Rem velocity (which is not a bad place to be anyhow). My good buddy and Sheep/Moose hunting partner shot his pet loads over the chrony and nearly #### when he saw the results. He had been laying game flat with these two loads and figured he had the Hammer of Thor in his "Big 7". His 175gr Corelokts with a heavy dose of RL 22 yielded just under 2600 fps, and his 162 BTSP's went just over 2800fps :shock:. The game however, never knew the difference (even his 750lb (dressed) 60" bull moose (200+" B+C), and he has not yet recovered a bullet. This however is certainly an extreme example on the low end, and I have a lot of respect for the 7 Rem Mag (however favor the '06 case).
280_ACKLEY
280_ACKLEY
Foxer...
Using the Hogdon book and max loads for 140 grain bullets I came up with...
.260 2730fps m/v
.270 2979fps m/v
.280 2927fps m/v
If you want to run a seperate set of ballistics with the base line of 3000 fps m/v for the .280 and the .270 it will probably show how the bullet length per weight efffects long range. :idea:
Using the Hogdon book and max loads for 140 grain bullets I came up with...
.260 2730fps m/v
.270 2979fps m/v
.280 2927fps m/v
If you want to run a seperate set of ballistics with the base line of 3000 fps m/v for the .280 and the .270 it will probably show how the bullet length per weight efffects long range. :idea:
The 7RM seems to be the number one cause of Chrony Induced Shock 8) BIGREDD, Nosler doesn't make a 140 gr. Accubond for the 6.5mm, but Hornady makes a 140 gr. SST, which would have basically the same B.C. Anyways, here ya go
260 Rem 140 gr. SST @ 2800 fps
100 yard ~ 0.0", 2635 fps, 2155 ft-lbs, 0.6" drift (10 mph crosswind)
200 yard ~ -3.5", 2470 fps, 1900 ft-lbs, 2.4" drift
300 yard ~ -12.7", 2315 fps, 1670 ft-lbs, 5.7" drift
400 yard ~ -28.4", 2170 fps, 1460 ft-lbs, 10.4" drift
500 yard ~ -51.6", 2025 fps, 1275 ft-lbs, 16.7" drift
270 Win 140 gr. Accubond @ 3050 fps
100 yard ~ 0.0", 2865 fps, 2550 ft-lbs, 0.6" drift (10 mph crosswind)
200 yard ~ -2.7", 2685 fps, 2245 ft-lbs, 2.3" drift
300 yard ~ -10.3", 2515 fps, 1965 ft-lbs, 5.3" drift
400 yard ~ 23.4", 2350 fps, 1720 ft-lbs, 9.7" drift
500 yard ~ 42.7", 2195 fps, 1500 ft-lbs, 15.6" drift
280 Rem 140 gr. Accubond @ 3100 fps
100 yard ~ 0.0", 2910 fps, 2630 ft-lbs, 0.6" drift (10 mph crosswind)
200 yard ~ -2.6", 2725 fps, 2310 ft-lbs, 2.3" drift
300 yard ~ -9.9", 2550 fps, 2020 ft-lbs, 5.3" drift
400 yard ~ 22.6", 2380 fps, 1760 ft-lbs, 9.7" drift
500 yard ~ 41.4", 2220 fps, 1530 ft-lbs, 15.7" drift
Really, who sights their rifles in for 100 yards anyways?
Brush hunters maybe, and then why would they shoot a flat shooting rifle if all their shots were 200 yards and in? Regardless, here's the comparison with 100y zeros and 140 gr. poly tipped boat tails at max safe speeds from 24" barreled sporters.
tb
260 Rem 140 gr. SST @ 2800 fps
100 yard ~ 0.0", 2635 fps, 2155 ft-lbs, 0.6" drift (10 mph crosswind)
200 yard ~ -3.5", 2470 fps, 1900 ft-lbs, 2.4" drift
300 yard ~ -12.7", 2315 fps, 1670 ft-lbs, 5.7" drift
400 yard ~ -28.4", 2170 fps, 1460 ft-lbs, 10.4" drift
500 yard ~ -51.6", 2025 fps, 1275 ft-lbs, 16.7" drift
270 Win 140 gr. Accubond @ 3050 fps
100 yard ~ 0.0", 2865 fps, 2550 ft-lbs, 0.6" drift (10 mph crosswind)
200 yard ~ -2.7", 2685 fps, 2245 ft-lbs, 2.3" drift
300 yard ~ -10.3", 2515 fps, 1965 ft-lbs, 5.3" drift
400 yard ~ 23.4", 2350 fps, 1720 ft-lbs, 9.7" drift
500 yard ~ 42.7", 2195 fps, 1500 ft-lbs, 15.6" drift
280 Rem 140 gr. Accubond @ 3100 fps
100 yard ~ 0.0", 2910 fps, 2630 ft-lbs, 0.6" drift (10 mph crosswind)
200 yard ~ -2.6", 2725 fps, 2310 ft-lbs, 2.3" drift
300 yard ~ -9.9", 2550 fps, 2020 ft-lbs, 5.3" drift
400 yard ~ 22.6", 2380 fps, 1760 ft-lbs, 9.7" drift
500 yard ~ 41.4", 2220 fps, 1530 ft-lbs, 15.7" drift
Really, who sights their rifles in for 100 yards anyways?
tb
Yeah Todd my rifles are usually 200 or 250 yard zeros...I was just looking for a comparison that people could easily understand. 8)
I can't find any data that lists a .280 at 3100fps ... or a .270 max load at 3050fps either :shock: I need more books. :wink:
Ok - here we go.
The first one is the 260 - i had to use the nosler partition instead, i don't have the accubond data. But it should be fairly close.
I missed your comment about the 100 yard zero. Sorry. THe 260 i zero'd at 225 and the 270 and 280 at 245, which my program says is the best for whitetail to give the max point blank zero. However, you'll notice that it also calculates total drop, so you can see how much each bullet has dropped for any given distance if it had been fired level.
ATMOSPHERIC CONDITIONS:
Altitude (Feet): 3000
Cross Wind (Mph): 10
Humidity: 78%
Pressure (In Hg): 29.53
Temperature (degrees Fahrenheit): 30
Range ...Velocity ...Energy ......Path... .....Drop .......Drift .......TOF... Zero Adj
(Yards) ..(FPS) ......(Ft-Lbs) ..(Inches) ...(Inches) ..(Inches) ..(Sec) ..(MOA)
0........... 2730 ........2317.... -1.50 ........0.00 ...........0.00.... 0.000... 0.00
50 .........2642 ........2169 ..... 1.13....... -0.60 ..........0.19 ....0.056 ...-2.16
100 .......2555 .........2029 ......2.52 ......-2.44........... 0.67 ....0.114 ...-2.41
150....... 2470......... 1896 ......2.58 ......-5.60 ..........1.49 .....0.173... -1.64
200....... 2386......... 1770 ......1.25 .....-10.17 ..........2.64 .....0.235 ..-0.60
250 .......2304 .........1650 .....-1.65 .....-16.29 .........4.26 .....0.299 ....0.63
300....... 2224 .........1537 .....-6.22..... -24.09 .........6.31 .....0.365.... 1.98
350...... 2145 ..........1430 ....-12.55 ....-33.65 .........8.78 ......0.434 ..3.42
400 ......2068 ..........1329 ....-20.71 .....-45.04 .....11.63 .......0.505 ..4.95
500 ......1918 ..........1143 ....-43.05 ......-73.84 .....18.60 ......0.655.. 8.22
The first one is the 260 - i had to use the nosler partition instead, i don't have the accubond data. But it should be fairly close.
I missed your comment about the 100 yard zero. Sorry. THe 260 i zero'd at 225 and the 270 and 280 at 245, which my program says is the best for whitetail to give the max point blank zero. However, you'll notice that it also calculates total drop, so you can see how much each bullet has dropped for any given distance if it had been fired level.
ATMOSPHERIC CONDITIONS:
Altitude (Feet): 3000
Cross Wind (Mph): 10
Humidity: 78%
Pressure (In Hg): 29.53
Temperature (degrees Fahrenheit): 30
Range ...Velocity ...Energy ......Path... .....Drop .......Drift .......TOF... Zero Adj
(Yards) ..(FPS) ......(Ft-Lbs) ..(Inches) ...(Inches) ..(Inches) ..(Sec) ..(MOA)
0........... 2730 ........2317.... -1.50 ........0.00 ...........0.00.... 0.000... 0.00
50 .........2642 ........2169 ..... 1.13....... -0.60 ..........0.19 ....0.056 ...-2.16
100 .......2555 .........2029 ......2.52 ......-2.44........... 0.67 ....0.114 ...-2.41
150....... 2470......... 1896 ......2.58 ......-5.60 ..........1.49 .....0.173... -1.64
200....... 2386......... 1770 ......1.25 .....-10.17 ..........2.64 .....0.235 ..-0.60
250 .......2304 .........1650 .....-1.65 .....-16.29 .........4.26 .....0.299 ....0.63
300....... 2224 .........1537 .....-6.22..... -24.09 .........6.31 .....0.365.... 1.98
350...... 2145 ..........1430 ....-12.55 ....-33.65 .........8.78 ......0.434 ..3.42
400 ......2068 ..........1329 ....-20.71 .....-45.04 .....11.63 .......0.505 ..4.95
500 ......1918 ..........1143 ....-43.05 ......-73.84 .....18.60 ......0.655.. 8.22
And here 's the 270
I used the ballistic tip for this one - closer to the accubond but also the only 140 i had in nosler
Manufacturer: Nosler
Type: 140gn Ballistic Tip, Spitzer
Case Type: Factory
Primer Type: Factory
Powder Type: Factory
Powder Charge: N/Agns
ATMOSPHERIC CONDITIONS:
Altitude (Feet): 3000
Cross Wind (Mph): 10
Humidity: 78%
Pressure (In Hg): 29.53
Temperature (degrees Fahrenheit): 30
Range ......Velocity...... Energy .....Path...... Drop .......Drift .......TOF ....Zero Adj
(Yards) .....(FPS) ........(Ft-Lbs) ...(Inches) .(Inches) .(Inches) ..(Sec) ....(MOA)
0 .............2979 ...........2758 .......-1.50..... 0.00 .......0.00 ........0.000 ....0.00
50 ...........2878 ...........2575 ........1.00.... -0.50 ........0.12 ........0.051 ..-1.91
100......... 2780 ...........2403........ 2.45.... -2.05 ........0.61 ........0.104 ...-2.33
150 .........2684 ...........2239........ 2.76 .....-4.73 .......1.45........ 0.159 ...-1.76
200 .........2590 ...........2085 ........1.88..... -8.61....... 2.61 ........0.216 ...-0.89
250......... 2498 ...........1940 ........-0.31 ..-13.80 .......4.15........ 0.275 .....0.12
300 .........2408 ...........1802 ........-3.82 ...-20.30 ......5.96 ........0.336 .....1.22
350 .........2319 ...........1672........ -8.88 ...-28.36 ......8.28 ........0.399..... 2.43
400 .........2233 ...........1550....... -15.61 ...-38.09 ....11.08 .......0.466..... 3.73
500 .........2065 ...........1326 .......-34.38 ...-62.85.....17.99 .......0.606 ....6.57
I used the ballistic tip for this one - closer to the accubond but also the only 140 i had in nosler
Manufacturer: Nosler
Type: 140gn Ballistic Tip, Spitzer
Case Type: Factory
Primer Type: Factory
Powder Type: Factory
Powder Charge: N/Agns
ATMOSPHERIC CONDITIONS:
Altitude (Feet): 3000
Cross Wind (Mph): 10
Humidity: 78%
Pressure (In Hg): 29.53
Temperature (degrees Fahrenheit): 30
Range ......Velocity...... Energy .....Path...... Drop .......Drift .......TOF ....Zero Adj
(Yards) .....(FPS) ........(Ft-Lbs) ...(Inches) .(Inches) .(Inches) ..(Sec) ....(MOA)
0 .............2979 ...........2758 .......-1.50..... 0.00 .......0.00 ........0.000 ....0.00
50 ...........2878 ...........2575 ........1.00.... -0.50 ........0.12 ........0.051 ..-1.91
100......... 2780 ...........2403........ 2.45.... -2.05 ........0.61 ........0.104 ...-2.33
150 .........2684 ...........2239........ 2.76 .....-4.73 .......1.45........ 0.159 ...-1.76
200 .........2590 ...........2085 ........1.88..... -8.61....... 2.61 ........0.216 ...-0.89
250......... 2498 ...........1940 ........-0.31 ..-13.80 .......4.15........ 0.275 .....0.12
300 .........2408 ...........1802 ........-3.82 ...-20.30 ......5.96 ........0.336 .....1.22
350 .........2319 ...........1672........ -8.88 ...-28.36 ......8.28 ........0.399..... 2.43
400 .........2233 ...........1550....... -15.61 ...-38.09 ....11.08 .......0.466..... 3.73
500 .........2065 ...........1326 .......-34.38 ...-62.85.....17.99 .......0.606 ....6.57
And finally, the 280. also a ballistic tip.
Manufacturer: Nosler
Type: 140gn Ballistic Tip, Spitzer
Case Type: Factory
Primer Type: Factory
Powder Type: Factory
Powder Charge: N/Agns
ATMOSPHERIC CONDITIONS:
Altitude (Feet): 3000
Cross Wind (Mph): 10
Humidity: 78%
Pressure (In Hg): 29.53
Temperature (degrees Fahrenheit): 30
Range........ Velocity ......Energy ........Path........ Drop........ Drift ....TOF ..Zero Adj
(Yards) .......(FPS) ........(Ft-Lbs)..... (Inches)... (Inches)... (Inches) (Sec) (MOA)
0............... 2979.......... 2758 ..........-1.50 ........0.00 .........0.00 ....0.000 ..0.00
50............. 2884 ..........2586 ...........0.98....... -0.50......... 0.11.... 0.051 ..-1.88
100........... 2792 ..........2423 ...........2.42 ........-2.04 ........0.57 .....0.104.. -2.31
150 ...........2701 ..........2268 ...........2.73 ........-4.71 ........1.36 .....0.159.. -1.74
200 ...........2612 ...........2121 ..........1.86 ........-8.56......... 2.46.... 0.215.. -0.89
250 ...........2525 ...........1982......... -0.27 ........-13.67....... 3.84 ....0.273 ...0.11
300 ...........2440........... 1850 .........-3.75 ........-20.13....... 5.58 .....0.334 ..1.19
350 ...........2356 ...........1725 .........-8.68 ........-28.04........ 7.71 ....0.396 ..2.37
400 ...........2274 ...........1607........ -15.24....... -37.58 .......10.30 .....0.461 .3.64
500 ...........2115 ...........1390 ........-33.56 ........-61.86 ......16.75 .....0.598 ..6.41
Manufacturer: Nosler
Type: 140gn Ballistic Tip, Spitzer
Case Type: Factory
Primer Type: Factory
Powder Type: Factory
Powder Charge: N/Agns
ATMOSPHERIC CONDITIONS:
Altitude (Feet): 3000
Cross Wind (Mph): 10
Humidity: 78%
Pressure (In Hg): 29.53
Temperature (degrees Fahrenheit): 30
Range........ Velocity ......Energy ........Path........ Drop........ Drift ....TOF ..Zero Adj
(Yards) .......(FPS) ........(Ft-Lbs)..... (Inches)... (Inches)... (Inches) (Sec) (MOA)
0............... 2979.......... 2758 ..........-1.50 ........0.00 .........0.00 ....0.000 ..0.00
50............. 2884 ..........2586 ...........0.98....... -0.50......... 0.11.... 0.051 ..-1.88
100........... 2792 ..........2423 ...........2.42 ........-2.04 ........0.57 .....0.104.. -2.31
150 ...........2701 ..........2268 ...........2.73 ........-4.71 ........1.36 .....0.159.. -1.74
200 ...........2612 ...........2121 ..........1.86 ........-8.56......... 2.46.... 0.215.. -0.89
250 ...........2525 ...........1982......... -0.27 ........-13.67....... 3.84 ....0.273 ...0.11
300 ...........2440........... 1850 .........-3.75 ........-20.13....... 5.58 .....0.334 ..1.19
350 ...........2356 ...........1725 .........-8.68 ........-28.04........ 7.71 ....0.396 ..2.37
400 ...........2274 ...........1607........ -15.24....... -37.58 .......10.30 .....0.461 .3.64
500 ...........2115 ...........1390 ........-33.56 ........-61.86 ......16.75 .....0.598 ..6.41
BIGREDD,
Drift is the amount of horizontal "drop" you will experience from a 90 degree crosswind of 10 miles per hour.
270 140 gr. Accubond @ 3000 fps
500 yard velocity - 2155 fps
500 yard energy - 1443 ft-lbs
500 yard bullet drop from 100 yard zero - 44.5"
500 yard wind drift in 10 mph crosswind - 16.0"
280 140 gr. Accubond @ 3000 fps
500 yard velocity - 2135 fps
500 yard energy - 1420 ft-lbs
500 yard bullet drop from 100 yard zero - 44.8"
500 yard wind drift in 10 mph crosswind - 16.4"
No difference whatsoever
You could expect maximum safe pressure loads to create these velocities in 24 inch barrels with the top powders. Anything faster is both too dangerous and foolish. Buy an STW if you need more speed. :roll:
Drift is the amount of horizontal "drop" you will experience from a 90 degree crosswind of 10 miles per hour.
270 140 gr. Accubond @ 3000 fps
500 yard velocity - 2155 fps
500 yard energy - 1443 ft-lbs
500 yard bullet drop from 100 yard zero - 44.5"
500 yard wind drift in 10 mph crosswind - 16.0"
280 140 gr. Accubond @ 3000 fps
500 yard velocity - 2135 fps
500 yard energy - 1420 ft-lbs
500 yard bullet drop from 100 yard zero - 44.8"
500 yard wind drift in 10 mph crosswind - 16.4"
No difference whatsoever
You could expect maximum safe pressure loads to create these velocities in 24 inch barrels with the top powders. Anything faster is both too dangerous and foolish. Buy an STW if you need more speed. :roll:
Foxer....thanks man Iam saving that data for the next debate...
Todd say:
Todd say:
Yeah or a .270 short mag.... I averaged 3160fps with 71.0 grains of Retumbo and the 140 accubond... only 14fps variance... and half minute groups at 200 yrds... I got over 3200 fps using IMR4831 and no pressure problems but the accuracy was not as good and the recoil was up there...the Retumbo is very user friendly :wink:
