Richard Jay King
Member
- Joined
- Sep 15, 2018
- Messages
- 135
30 Years ago when I started loading for my .270 I was able to get a little over 3000 fps from a 130 grain bullet in a 20" barreled Winchester Mod 70!!! I was using DuPont IMR4831 from that time period and my load came right out of the DuPont Handloaders Guide. I will not mention the exact load because it well exceeds current loading manuals for this powder. The load I used was accurate and showed NO pressure signs..Bolt lift was normal and no ejector mark was on the head of the case. It is obvious that the newer lots of IMR 4831 are faster burning than those old lots so If I were still loading for the .270 today I might try IMR7828...Currently this powder seems to be very similar in burn rate to the IMR4831 of old...