Really depends on where you play, the rules in place and the shell you use.
Locally the rules for all grenades are that ricochet BB's from them score as a kill. So you can bounce the shower into a structure which is very realistic IMHO.
It's very difficult to get the shot angle correct for anything but direct fire (inside 50feet). They are definitely best employed into a confined space with lots of room for the BBs to bounce.
Also I think a lot of people trying to run the cheapest, lightest BBs possible in them and that really isn't the recipe for getting range from a single-dump gas weapon. Going with at least a .3g gets a lot more energy even out of propane shells. The longer shells also seem to get better efficiency from a gas charge but at the expense of taking up quite a bit more room.
-Grant
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