>>302704991
Frags across bridge into CT side seem like a waste unless you know someone pushed up too far or you've smoked it off, which I find tends to bait CTs into moving out of the safe zone. Anyone playing behind the cover at the back of CT side won't be damaged by 95% of cross bridge or under bridge nades.
Smokes to make life difficult for CT snipers at B doors is a good use of $300 to me but if you have the throwing accuracy frags would work well too.