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Looking for a New 7mm to Shoot

If you're chasing ballistic efficiency (ratio of the kinetic energy of the projectile to the total energy released by the propellant), you can bump that number by playing with energy density. For example, IMR 4831 has a volumetric energy density of 3,245 J/cm^3, and 55.4 grains of that powder...
- back_at_it
- Post #74
- May 9, 2024
- Forum: Reloading
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Looking for a New 7mm to Shoot

Sorry, I neglected to re-set the temp. for the 7mm Rem. Mag. load. Here's the right QuickLoad image. At 35 degree the load becomes compressed, the propellant burn is just short of 100%, and the ballistic efficiency is 27.5%. Switch to 6.92 grains of IMR 7828 at the same temp and muzzle...
- back_at_it
- Post #73
- May 8, 2024
- Forum: Reloading
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Looking for a New 7mm to Shoot

A recent post doubted the possibility of getting a 280 AI to push a Berger 180-grain VLD-H at 3,035 fps. I developed my load at 35 degrees F, for hunting in the Rockies in Oct.-Dec. Using RL-26 with that bullet in a 27" barrel, COAL = 3.579" (just a few thousandths off the lands), QuickLOAD...
- back_at_it
- Post #72
- May 8, 2024
- Forum: Reloading
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Looking for a New 7mm to Shoot

I have a Remington 700 in 280 AI, Lilja 26" barrel. It shoots Berger 180-grain VLD-H at 3,035 fps with RL-26 powder. Very efficient cartridge IMHO.
- back_at_it
- Post #68
- May 4, 2024
- Forum: Reloading
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280 AI Real World Feedback

I have a blueprinted stainless steel Remington 700 in 280 AI with a 27" Lilja barrel, Jewell trigger, etc. I load 180-grain Berger VLD-H bullets with RL-26 to 3,035 fps and get 1/4-1/2 MOA accuracy consistently at the range. (Last time out, first shot at 200 yards was 1/2" from the center of...
- back_at_it
- Post #47
- Nov 20, 2023
- Forum: Firearms