9 oz c02

9 oz is like 500 shots i think with a 98 custom

it depends on how much you should and how my games in between games.

cause if you play at your own field and dont get fills for a while then you might want to think about a 20 oz

I would suggest instead of bigger get more. WAY back i before I could get nitro anywhere close I needed to use co2. I would use a couple of shorter tanks. a 9 and 12 would last as long as needed and then some.

I had a 9 and 12 but then i just got 2 20oz's they lasted for about 800 shots on my spyder compact and 1000 or more on my impy nothing i have nitro though.