My SP10 and GAP-10 will not chamber Berger 140 Hybrids, they do good with Berger 130 AR Hybrids.
My 24” proof steel barrel shoots the 135 A-Tips at 2900 with 44.8 gr of StaBall. If you want speed, change powders.
My SP10 22” shot 147 ELDs the best, 2700 fps with 43.3 gr of StaBall.
GAP-10 22”...