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Sierra 125 SPT
Sierra Reloading manual shows Maximum load with AA#5 for a 125 gr. SPT to be 12.6gr. This produces 1800 fps out of a 10" Contender. Is this Maximum load based on pressure capacity of 221 Fireball brass or the contender frame? I ask because I have some #5 and I wanted to load up some hot rounds but I'd like to get at least 2200fps. 12.6gr is not a lot of powder. Bad idea?
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