[MrWray]

Everyone sing the dirty butt song!!

[sagenodland]

Well this thread is a little...off topic
Yeah I'll say off topic

[big shrek]

There are so many factors that it ain't even funny, up to & including the barrel heating up and moving ever so slightly...

Look up "Cold Bore Zero" and go from there...

[Biggjimm]

I think a lot of it has to do with a clean bore having more friction than after its had a couple rounds run through it & also once you've shot a couple rounds thru a clean bore the fouling allows for a tighter seal to the rifling & all the expanding pressure staying behind the bullet & pushing it allowing for greater accuracy? Seems to make sense but I could be totally wrong??? All I know is my 10/22 will have a couple flyers in each group for the first 10 or 12 shots if I have thoroughly cleaned & scrubbed the bore, which I don't do very often. Usually I just run a patch thru 1 quick time with hoppes or rem bore bright & pull a bore snake thru about 5 or 6 times & it will stay pretty consistent from the first shot on. Most of the diff is me I think. If I'm not going shoot for a while I'll run an oil patch thru it but clean it out before shooting it next time.

[winds-of-change]

I know several experienced shooters who don't clean their .22's until it starts to misfire. I don't clean my .22 after every trip to the range but I do clean it before it begins to misfire. I can't stand a dirty gun and I'm afraid it's going to ruin the finish if I leave it dirty. I just think .22's do better when after some use.