I'm new and just starting out so sorry if this is a stupid question, but which of the two calibres is used more commonly? I'm looking at going to walk-ons and they make you use their paint, but which size do they have? Is it one in particular or do they stock both? From what I've seen the .68 cal is more popular but the .50 cal is gaining traction and as far as I know, is always used in rental so I don't know whether to go for a 50 cal or 68 cal... Thanks to anyone that replies