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I know you didn't ask for what our pet loads are, but 5.0gr with COAL @ 1.230" has been great for FMJ and 4.8gr for lead bullets. This recipe bodes well in the following guns:
Les Baer Monolith Commanche-This is a 1911 in 4 1/4" barrel
Springer Loaded 1911 in 5 in. barrel
Colt New Agent 1911 in 3 in. barrel
XD45ACP in 4 in barrel.
Bottom line is barrel length hasn't really been an issue on velocity, burn characteristics, etc.
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