Actually, the best for a multi-shot shotgun for CQB is to mix BB weights. Use .12 (good quality) .2, .25, .28, etc. Mix them randomly in your speed loader, and load your shells. The hopup is fixes and set for .2, so different weight BBs will have different backspin and will give a better spread. It's much more realistic in terms of spread than you can get using the same BB weights.