Re: Maybe a silly question...38 +P
If for say you have a 357, you can use 38 +P. Most newer 38 only guns are marked if such ammo can be used. About the only ones I see anymore are snubbies. I have a 38 snubbie, and it's labeled for such use.
MY 9mm is also labeled for +P loads. Not sure if I ever saw a +P 9mm round as they are already a higher pressure round. The 38 has been out for over a hundred years, and some of the older guns aren't able to handle the higher pressures.
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