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I like the Winchester M-22s more, the bullet is rounder and feed 100%. The 555s have a slight truncated shape that will FTF every 20 rounds in my dedicated 22LR AR upper. Both are pretty clean, the powder charge and groups are very identical.

Oh, the AR uppers actually group tighter w/the dreaded Remington GBs than CCIs, go figure. And, they don't have any FTF or FTEs either w/GBs.
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