Today I went out and shot from 41.5-43.5 grains of H4350. Hornady brass, 130 grain ELD-M.
All groups were 5 rounds thru a bartlein 5R, 8 twist, 18” barrel on a G2 gas gun.
41.5= 2.267”
41.7= 2.746”
42.0= 1.556”
42.3= 0.556”
42.6= 1.247”
42.9= 1.114” (4 in 1 ragged hole at 0.433”) and then a...