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Tony/Marraki is spot on and has been at the .577 game for a long while. My own experience with NE loads is with my 1902 Webley .577 3” with 28” barrel that weighs 11lbs 6oz. It is about my pleasure tolerance ![]() I started with the “1.19 x Cordite load” of RL-15 and backer rod then worked up to equal the old velocity claims, no reason to change. Easily loaded down a bit as well….. - Mike |