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On a side note, would .22 mag lose much with the 18 vs the 22 inch barrel since my understanding was that they were usually loaded with slower burning powders?
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You won't lose enough to matter, if anything at all.
Even with a 16" barrel, performance would still be largely unaffected.
Almost every .22 WMR load on the market is optimized for a 10" to 14" barrel.
(Winchester is at the longer end of that spectrum, ArmsCor is somewhere in the middle, and CCI [everything else] is at the short end.)