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Old April 8, 2013, 08:33 AM   #4
oldpapps
Senior Member
 
Join Date: September 22, 2011
Location: Middle America
Posts: 445
Logic would say slower powder for a longer barrel. However, its a gas weapon. So, keep the powder in the right burn range and both of those listed are.

I would test them both. The one that gives you the beat results is the one to go with. I wouldn't want to hazard a guess. If no determinable difference/s show up, move on to other factors (availability, cost, ease of use....).

Load safe,

OSOK
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