USPSA caliber question.
7.62x25mm will easily make minor power factor.. but is there a rule aboutt he actual diamater of the bullet? I was told 9mm is the smallest diamater you can use however it really doesn't make sense to me why it would matter as long as you still make PF.
What about IDPA as well?
I would like to be able to start competing before I buy a new gun (its's not as easy as you would think in the wonderful state of NJ)