Originally Posted by bigsky
Speaking of pressure .280REM..... What is your pet load? I am working up a load for a Cooper M52 in the .280 Rem. I plain on shooting 150 grain Swift Scirracos.
With 139 Hornadys I use 59grs R-19, Rem Brass, and WLR primer. Runs 3150fps. Horady's have the shortest bearing surface, and give better velocity with safe pressures. I've shot a lot of deer with that load.
With several 140s such as Accubonds, Ballistic Tips I run 61-61.5grs of R-22. Same brass and primes. I tried mag primers too with little difference. That runs @ 3080-3100. I stop at 3100 with all but the Hornadys.
Other powders I've had success with are N160 with 140s, N165 with all wts. N160 is just a bit slower than H4350, but not much. N165 is about a grain slower than R-22.
And I've run 60grs of H4831 with 154 Hornadys at about 3000fps. Shot a few deer with that too. My M700SS .280 loves Hornady bullets for some reason. Puts most in one hole.
Heres a pic of a 3 shot 100 yd group with a really sweet load.
Unfortunately it was a bit warm!
I backed it off a bit down to 3100 and it's still very good. However, it's with the old, no longer made 140 Nosler Solid Bases. I found an unopened box of 100...I still have about 85 left.