How do I know what weight steel my bands are meant to shoot? Ive shot B,B's from thin chinese bands the ones with the little pouches. with good results Now ive been playing with theraband gold. 3/8 and 1/4 are the caliber ammo and they work. I also shot white dollar store marbles. I cut my own pouches from good thick leather, my question is, does the size of the pouch have any effect on ammo size?