I am sure this has been discussed before but I can't get any useful results from the search feature so here goes again.
I have a 264 Win Mag with a fairly new barrel. The first round from a cold barrel always goes an inch or more above the rest of the group. It is aggravating for a new barrel to behave this way. Is there any wisdom out there on why a rifle does this? Is it related to the throat? Type of powder? Primers? Weight of barrel? My current load is a 120 TTSX over Magnum with a Federal 215.
