Hunter,I usually do a small break in on a new barrel.I shoot 1rd & clean the barrel for the first 10rds,then shoot a group of 5 & clean.I usually do that for several groups.It's time consuming,and a PIA to do.
The main thing is to not get the barrel too hot,let it cool between shots.Even if you don't do a break in on the barrel,Let it cool between shots.
As far as ammo goes,you'll just have to find out what the gun likes to shoot.Each rifle shoots different,the ammo my 308 likes might shoot like crap out of yours.
Most premium ammo today usually shoots decent out of production rifles.I load all of my ammo,so each rifle has loads tailored to what they like to shoot.
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