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Old June 14, 2013, 02:19 PM   #6
44 AMP
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Join Date: March 11, 2006
Location: Upper US
Posts: 11,122
The 250gr bullet on top of 10gr Unique does 1000fps+/- depending on pistol barrel length, and it is top end max for a Colt SAA in the old reloading books. That load will be safe (although top end) in a New Vaquero, or your carbine.

No idea what that load will do out of a carbine barrel, but I would expect another 200+ fps or maybe more, at a guess. A load with a slower powder would likely give higher performance from a carbine, but not quite so much from a pistol.
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