Sometimes you just have to ignore the norms that everyone else is complying with. Just for the heck of it I seated the 250 Berger EH bullet to magazine length. When I measured the loaded round it left the bullet .215" off the rifling.
At 300 yds, 3 out of 4 bullets went into .5". A fourth round opened the group to 1.3.
I repeated this load for the following week and shot groups at about 1.5 @ 300yds.
BTW - I loaded some up that we're .020" off the rifling and they shot patterns rather than groups.
It's worth a try .