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Here's another gem about rimfires: one of the deciding factors on accuracy is bullet diameter.
Take a good micrometer to different brands/types of ammo and you'll see remarkable differences in bullet diameter. I've measured .22LR bullets that range from .221 to .225".
In my Rem 782 rifle, the larger bullets are MUCH more accurate. It may not be a coincidence that all the match or target-grade amo I've measured runs in the .223-.224" range. My bore is dead-nuts standard at .222" by the way.
Something to think about.
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