7x57, 280, 7x64?
- Thread starter Slimbo
- Start date
The 280 can be loaded to greater than SAAMi pressures safely. Loaded to a pressure level considered normal for the 270 (or the 280AI for that matter) the 280 will give up very little. Try it you will like it.
patricksbb391
CGN Regular
- Location
- Ottawa & WMU 62
Why not sell me that M70 and get yourself another? PM me.
I like 7X57 have numerous military rifles in that caliber, and one custom built 7mm in a commercial Mauser action.
I never shoot it as I had an older Remington 700 BDL rebarreled into 7mm08 to make a light hunting rifle.
To get the performance you should reload the 7mm, the selection of commercial ammo is a narrow field and under powered.
I never shoot it as I had an older Remington 700 BDL rebarreled into 7mm08 to make a light hunting rifle.
To get the performance you should reload the 7mm, the selection of commercial ammo is a narrow field and under powered.
BigUglyMan
CGN Ultra frequent flyer
- Location
- New Scotland
Well, as Dr Phil says..."Would you rather be happy or right?"
I should have finished my sentence properly. Sectional density is better in heavier bullet weights regarding the 7x57. Velocity isn't always the best option when hunting. I believe 284 cal 175gr bullet at 2400fps will give much better penetration than a 277 cal 150gr bullet will at 3000fps within 300yds
When comparing sectional density's of the 277 cal vs 284 cal they are very close in most bullet weights under 150gr (I was using the Hornady manual for comparison).
Sectional Density is a number calculated from a fairly simple formula: weight of bullet in grains divided by 7000 (# of grains in a pound), then divided by the squared diameter of the bullet. This answer is the sectional density on any bullet of this weight and diameter, regardless of construction.
What you are talking about is the function of factory twist rates between the 2. Ths limits the 270 (1-10) to 160gr pills with a SD of .298. Now the same bullet in 284 has a lower SD of .283, but due to the the faster (1-9) twist of most 7mm's they can handle longer heavier bullets which will get you a higher SD. You can get custom 270 barrels in faster twists if someone was really dedicated to that cartridge, and could shoot 175 or heavier bullets, all which would have a higher SD then a comparable 7mm weight bullet due to it's smaller diameter.
These days though, bullet performance comparison needs to be not only limited to same bullet weight, but same bullet construction. A 150TSX/Partition/Aframe in 270 will penetrate far more animal then a 175 cup/core in 284 at any distance.
While the 270 will do most anything the 7's will do, the one thing it can't do is; be a seven. I also am torn between the 7x57 and the 280. I have a 7x57 but often look at it while holding the 280 reamer. So far, it's still a 7x57. In truth, there are few circumstances where the difference would be all that apparent.
I have a lovely BRNO 21 7x57 with the double triggers that is so accurate I don't even bother to shoot targets much with it.Makes one hole pretty much with either 140gr or 160gr.Very surgical for sniping game off the shooting sticks.Win 760 and mag primers gets the nod with 140gr and stiff load of RE#22 for the 160gr .Also use a 6.5x55 Win FWT when the urge hits me.I've come full circle from the magnum faze of my youth....still like my .300H+H and .308NM but then there's the .250 Savage........Harold
Some of those itches are hard to scratch but I agree with "guntech". 0.007 difference between what you already have in your 270 versus a 7 mm may not be enough to reach the spot.
I have a .25-06 and a 280 and had a 270 at one time. The 270 is a fine cartridge and there is always ammo available. The LGS has lots of 270, 6 boxes of 280, no 7 x 57 nor 7 x 64 and those are all considerations when even 100 miles from your "forgot my ammo at home" even when you hand load.
I have a .25-06 and a 280 and had a 270 at one time. The 270 is a fine cartridge and there is always ammo available. The LGS has lots of 270, 6 boxes of 280, no 7 x 57 nor 7 x 64 and those are all considerations when even 100 miles from your "forgot my ammo at home" even when you hand load.
I should mention; when I got my 7x57 reamer, I had it made with a neck diameter which would be compatible with a 280 reamer. Otherwise, the 7x57 neck is large and when re-chambered to 280, there is a step in the neck. I also have a reamer to remove the step where it exists in re-chambered Mausers.
