Found a target pic, this was when barreled action was completed but didn’t have scope, stock , or bipod so threw a scope, extra stock, and atlas bipod on to get started with load development and break in, first 15 rounds out of the gun, cluster of rounds was first 5 shots with 5 different shooters, then 2 more 5 round groups
Bmg has 150 rounds down the tube
375 has 60rds down the tube
Load info:
400 grain combined technology(943 bc)
Peterson brass
139 grains 50bmg
Over 60 rounds velocity 2950-2953