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I'm a newb at rifles (but I now a little about pistols) so please correct me if I misunderstood some of my reading.

From my understanding, rebarreling on a new rifle serves only to stiffen the barrel against harmonic vibration (not to much on a .22lr). Many custom gunshops like to include at least a trigger job and stress modifying the chamber and crown, bedding the rifle and freefloating the barrel.

From my understanding, much of the mechanical inconsistency in the .22lr semi-auto rifles is due to each bullet being seated differently when the bolt chambers a new round. For superior/professional accuracy, these shops ask to modify the chamber for a particular brand/type of ammo.

Lastly, there was a report on .22 magnum ammo (some gun magazine), where the author measured the slight differences in weight/etc of the ammo he got from the same box/brand. By putting the like bullets with like, he substantially reduced his groups. Hope this helps.
 
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