I don't have a lot of specifics but here is what I know; My dad has a Ruger M77 heavy barrel in 22-250 and it has issues. The gun is out-of-the-box factory and I am sure the barrel is free floated. With a variety of hand loads and factories he has shot it gets ok accuracy (3/4 in @ 100yds). Here's the issue; if he shoots a long string, 10 or more shots, the gun seems to settle down and starts shooting into about 3/8in. If he lets it cool off the whole thing starts all over again. It is a consistant gun, it does the same thing and shoots the same with almost all loads he has put through it and it starts to settle down after 8-10 rounds shoot rapidly. He wants it for coyotes in eastern Oregon so he needs the first shot to count, but as he says; the gun likes to shoot hot. If any of you folks who know LOTS more than me have any ideas I would be thrilled to hear them. Thank you in advance for your help.