RD57
Well-Known Member
My info is with Nosler 150 BT's, just a pre-load to test 150 Accubonds later. Winchester Classic Stainless 24" barrel, Winchester Brass, Fed 210M primers seated 3.381" (.015" from lands). I started with 53.6 grains working up in .5 grain increments. I had some single digit SDs at 54.6 & 55.1 grains and very good accuracy 1" at 200 yards. At 55.6 grains the SD jumped to 19.5 and group went to 1.5" at 200 yards, at 56.1 grains the SD jumped to 30.7 fps and group jumped to 1.75" at 200. I didn't test past that, and unloaded remaining rounds. Hope this helps in your quest.
By the way, Speer data tops out at 54.7 grains of RL23 with their bullets.
By the way, Speer data tops out at 54.7 grains of RL23 with their bullets.
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