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ears - my barrel is a 1-14 twist Shilen (Contender carbine)that probably won't shoot 55's worth a damn......never tried. I have alot of AA 1680 powder around for a different project gun and noticed that the AA loading data lists it as a top performer in the .221 ....just another option. I may give it a try but I will say that thus far my .221 has launched just about anything 50 gr. and under extremely well....its not picky at all.
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