I used to be able to hit a silhouette at 350 yards 6 out of 8 times with a M14 in the standing position with peep sight. The only bi pods were on the M60 machine gun and no scopes. You are getting out to a range where there is not enough energy in the bullet to legally take that shot. I would not do it with a 308
I agree. If you can’t be sure of a clean kill, you shouldn’t make the shot. It comes down to good stewardship.