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The best way to tell is to simply look at the gun. Modern 37's have their caliber listed on the barrel. I have heard of some 37's having the +p marking, but I own one that does not.

Next, I would advise you that using +P ammo in most airweights is a bad idea! The 37 I have will handle them fine, but it causes more issues upon ejecting spent cartridges etc. The idea is that the long term repercussions are too stiff to use +p on a consistent basis. If you are going to use a good +p round to carry on a daily basis, then that might be fine, but I would NOT go to the range and practice with that type of ammo!

Stick with a good 38 round! the +P doesn't create all that big a difference, if you make a good shot!

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17y ago

What else can I help you with?