it depends how much FPS (feet per second) your gun has. If it is at least 350+ FPS then i would go with the 8mm anything below that and the BB could break and jam your gun. But if u have a shot gun use 8mm. now this is for AIR SOFT GUNS
For BB guns, it still depends on the FPS but the BB wont break its just your accuracy wont be as well higher power should always use 8mm if its 450+ FPS
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