Barrels should be "broken in" but few shooters are patient enough to do it. IME it does make a difference. As the barrel is shot, clean it every round for 5-10, then every 5 or so. What you are doing is allowing the bullets to wear off any burrs remaining from the rifling process by keeping the bore free from fouling. You will likely find that the more you shoot it, the better the barrel will group. As stated, it can make a big difference letting the barrel cool off between groups.
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