Snipers who dont need an excessively heavy BB may want to consider 0.28g ammunition. Its an excellent middle ground between mid-range and long-range BBs, and you can still hit targets farther away without an issue. You cant have too much muzzle velocity, however.
These 4,000 BBs are all contained within a packet. You can go to the range with this many rounds and still come back with quite a few left. Even war games wont use this many at once.
The rounds glow green in the dark and feed into the guns smoothly. Its an excellent choice for your longer-range guns if you value performance and utility.