Minimal ricochet means fragmentation.
A .310 round ball is a compact 46?grs, compared to cci's 40gr segmented subsonic loads at 710fps. How much segmenting goes on I'm not sure, but if I'm really worried about ricochets and noise I'll bust out the .22 nitro piston. 14gr at about 650 fps. Works good.
I know the 40gr solids I used to use as a kid would sure bounce.