Originally Posted by DannyR
Your best bet is a G17. You can use it in:
The 17 would be the cheapest.
A 26 can be shot in an additional category (subcompact) and the 29 or 30 can be shot in EVERY category; ammo would be more expensive though
Ammo hoarders- I picture them sitting Smaug-like on 25,000 round pile of mixed ammo; not shooting it, just collecting it.