For what it is worth, my 140 bthp load is 42.1 & my 140 eld load is 41.1. Just watch for pressure signs.So i have A GAP TEMPLAR 6.5 I took off the titan break and put on a YHM 7.62 break with qd for my suppressor. Using hornady match ammo i was getting .21 groups to .45 (shooter error im sure) but now with the new muzzle break i ran a satterly extended 5 shot per load ladder 39.1 grains of h4350 to 40.9 grains. best group is like 40.3 grains that had a SD of 10.3 but my 40.9 2715 FPS had a 5.6 sd with a ES of 10 . but no one hole shots that im looking for. Max load according to sierra is 40.6 should i go higher looking for a better more solid node or is it the muzzle break? Do you guys look more at SD or group size? or will the lower SD get you a better group?
I look for velocity flat spots between charges when developing. Usually 2 maybe 3 rounds of each charge weight & on 6.5cm, my first test is 0.3gr increments (I refine after down to 0.1). After that, seating depth testing.