I have a question for the experienced hand gunners on here. If you load 9MM bullets in a 38/357Mag how much velocity will you loss because of the smaller 9MM bullet about 2 thousands I believe. Thanks for your time. Cheers NC
Not enough to worry about. Maybe some leading with cast / swaged bullets.
I sometimes load .380 ACP bullets ... .355, 88 and 90 grains ... in .357 mag cases or .357 maxi cases, taper-crimped, for shooting jackrabbits. I don't recall what my .357 mag load was. They were for a Ruger 77/357 bolt action so I didn't have to worry about magazine spring tension, etc. The .357 maxi loads used 31 grains of either H110 or Win 296. Don't know that I'd use them in a revolver, might have some problems with the forcing cone, but in a solid barrel like the bolt action or Contender they worked well for me.
Tom