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The 400 CorBon is at it's best with 135 to 155 grain bullets. The 10mm works great with 180 grainers. That's where the 10mm would have an advantage over the 400 CorBon but I do love shooting those little 135's in my converted G-21sf.
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Cowboy Glock Shooter
SASS - GSSF - IDPA - NRA
Certified Glock Armorer
Carolina Glockers 1881
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