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I recently bought a box of 20 of Bullalo Bore 185g JHP +P. The box (which I don't have with me at the moment) states some 1150 FPS and 540 ft/lbs of muzzle energy.
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That load is not as stout as my old 45ACP pin load, it's only making a 212 power factor.
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Do I want to shoot these in my Colt Series 80 1911? My gun was made in 1984. I have the strongest Wolf recoil spring in it - 22Lbs, I think. It's also got a recoil spring bushing. So I think I'm good there. But I'm still concerned.
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Shooting them in your Colt should not be a problem, however you have way to heavy of a recoil spring in your gun.
Best Regards
Bob Hunter
www.huntercustoms.com