Jekyll and Hyde - the 7mm Remington Magnum

I have yet to see any evidence that a game animal gives a hoot about how much actual
energy it will take to kill them. 1500 lb/ft is a very arbitrary number, AFAIAC. D
 
AP said:
a careful reloader with the right powder can get 'very' close to 3000fps with a 270W and a 160 nosler partition
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What is "very close"? 150 fps? If it is much less than that, your pressures are quite high, regardless of propellant used.
Additionally, the 160 Partition [a very fine 270 bullet, BTW,] is a semi-spitzer, thus less suited for longer ranges. D.
 
The example of the barnes factory vs the handload certainly isn't isolated, had 250gr partition 338wm Fed Premium load, advertised @ 2660, shot 2440. Same gun, 75gr h4831,CCI250, same brass once fired, same bullet, 2750. Had it go the other way around as well. Depends a lot on the gun.
 
RL 26 really performs with the 145 ELD-X and 150 LRAB in an 8.5" twist, 26" Jury Barrel, chambered in 270 PHC. Found what should be an accuracy node between 59.5 grains (3182 f/s) and 60 grains ( 3183 fps) with the 145 ELD-X. 60.5 jumped the velocity to 3238 fps but the Rem 9 1/2 primers are past their max pressure in the Win Model 70. PBR +/- 3" about 320 yards and it still has 1500 ft. lbs. energy at 610 yards. The 150 LRAB, with Fed 210 primers, shot in the same hole as the 145 accuracy node at 3096fps with no strain on the brass or primers but likely near max. At that speed the LRAB maintains 1500 ft. lbs. at 685 yards and +/- 3" PBR is about 300 yards.
 
Eagleye said:
What is "very close"? 150 fps? If it is much less than that, your pressures are quite high, regardless of propellant used.
Additionally, the 160 Partition [a very fine 270 bullet, BTW,] is a semi-spitzer, thus less suited for longer ranges. D.
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by 'very close' I mean 'over' 3000fps. I used an old Higginson powder called #49 produced by Nobel. The powder was labeled "use 4831 data" ... #49 was even slower than H4831 and gave that velocity in a ZKK600 with NO apparent pressure signs. No hard extraction, no flattened primer no unusual expansion or stretching. Cases looked like all the others that were loaded for the series of tests from much lighter until I got these results and stopped. I am not 'challenging' anyone to try this and I have never bothered to attempt to duplicate it with any other powders. Just saying that in that particular rifle with that particular powder, of whatever age it was (and primer/case etc etc) ... the chrony read over 3000fps - for several shots. Perhaps if it had been 20 degrees warmer out side the results could have been less satisfactory. But regardless ... dont underestimate the 270W .... and the 160 partition seems to be pretty happy in some 270W rifles
 
I worked with that Higginson's #49 powder back in the 1970's/early 80's. It was a tiny bit slower than H4831, but also bulky,
requiring some heavily compressed loads in many applications. Never seemed to mind being compressed, though.

I used a lot of powders from Thomas back in the day, and still have a small amount of a few. [HP-104, 47SB, RP-5, WC755, WC 852]
The HP-104 later was re-labelled 47N. RP-5 is Bofors of Sweden, identical to Norma MRP. There were 2 lots of WC 852, one quite a
bit quicker burning than the other. I have the slower lot, very close to old H450.

Almost forgot, I have about 3 lbs of W760 SL131, a slower lot of W760, even slower than 47SB Lot 10.
While all these were somewhat temp sensitive, [with the exception of RP-5, which does not seem to vary much at all],
they work extremely well inside their specified parameters. Dave.
 
I am not surprised at all at the factory load chrono numbers for the 7mm mag. I was running some factory loads through my 26" bbl m700 and the Remington 150s were doing all of 2900 and change and the 175s were 2800. The Federal 165 gr Gameking load was a little closer to spec at 2880 as was the Hornady 154 gr Am Whitetail was 2990.

But the 30-06 guys ought not to laugh too hard because I ran a bunch of factory 180s through 2 different 30-06 rifles , a tikka and a Remington 760 and both averaged 2575-2600 with different lots of Rem CL of Federal blue box. :)

On the plus side my 7mm mag gets 3040 fps with Retumbo and Hornady 162 gr SST . As an extra bonus the Woodleigh 160 gr pp shots to the same point of impact which is nice.

Edited to add: I also got a little over 2700 fps out of 200 gr partitions and gamekings in my 30-06 with superformance powder, with good accuracy as well. There are no flies on the old 30-06 either! :)
 
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some more factory 7mm lame ass results :

7mm Rem Mag, Remington 150gr Core Lokt ~ 3110 fps claimed
24.4" Tikka T3x ~ 2993 fps

7mm Rem Mag, Hornady American WT 154gr Interlock ~ 3035 fps claimed
24.4" Tikka T3x ~ 2744 fps

7mm Rem Mag, Federal Premium 160gr Nosler Partition ~ 2950 fps claimed
24.4" Tikka T3x ~ 2800 fps

 
Na; variable. Some will make speed; others make a 30/06 look like a ring-tailled wonder. And this is coming from a guy who has been accused of liking 7s. You never see an STW, 7-300 Win or 28 Nosler getting trampled on by a 308.
 
chuck nelson said:
I’ve never owned a 7 magnum that could be beaten by a 308. Ever. Come to think of it, Ive never met a 7-08 that could be either.
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You probably haven't flown to the moon either. That doesn't change the fact that beating the dismal 2768 fps of those factory loads with a .308 isn't much of a trick. My only remaining 7 Rem clocks out at 3000 fps with 160 ABs and 7828. That doesn't make the Barnes load any faster either.
 
Dogleg said:
You probably haven't flown to the moon either. That doesn't change the fact that beating the dismal 2768 fps of those factory loads with a .308 isn't much of a trick. My only remaining 7 Rem clocks out at 3000 fps with 160 ABs and 7828. That doesn't make the Barnes load any faster either.
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I’m not foolish enough to compare apples to grapefruits either. Anyone can manipulate a myriad of numbers to get what they want. Some are darn good at it.
 
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