I am also trying the hammers out of my 7 mag. I have the 131 and 143 HH’s . I’m getting 3370 fps with 66 gr of h4350. Just under 3/4” groups at 125 yards. One load shot with the 131hh with 67.5 gr h4350 produced 3508fps but a sh*#ty 3.5” group. I’m shooting a browning xbolt with a 1-8 twist. I...