Sounds like Wyoming doesn't want too many hand gun hunters. I can't think of too many standard revolver chamberings that reach 500 ft lbs at 100 yards. .500 S&W is about the only one that comes to mind, that leaves pretty much only Contender and Encore handguns as the legal choices. Colorado requires a minimum of 500 ft lbs at 50 yards, so the smallest pistol cartridge that makes this energy level is .41 Magnum. Rifle cartridges must have 1000 ft lbs of energy at 100 yards.
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