if old 995 75 995rs 170
Each weapon will show a preference for one or two brands/bullet weights. You have to buy as many different types as you can afford and shoot to find out.
There really aren't any
100-500 USD
250 USD or so
about 120
500 or so
A mile or so
Tech 9, 9mm rifle and a couple shotguns.
The Marlin 9mm Camp Carbine will accepts the S&W Mod 59 Magazine . Joe-R
Best left to a gunsmith
The question is so vague as to be meaningless. The answer depends very, very much on the details of where, how, and what exactly a "9mm" is (9mm handgun? 9mm rifle? 9mm assault rifle? 9mm machine pistol? something else?).