0.25g bb pellets are a good weight ammo to use with sniper rifles or high power electric rifles and gas guns ect. a rough guide would be for example airsoft guns that shoot between 330 to 420 fps to use the 0.23g bbs here. we do also sell marking pellets and tracer, glow in the dark & Biodegradable pellets at this weight as well. Need more info? Click here to see our BB Pellet Buying Guide.