Sharpshooter vs GWM

[Man_Over_Game]

David Weber's books have given me the impression that you reload it by lying your back and cocking it with your feet, before poking your head up out of your ice hole to shoot again at the Temple Guardsmen. Seems reasonable but I don't know if it would work in practice. In any case, that's about reloading instead of aiming.

Maybe crossbows should have a ROF penalty while prone instead of disadvantage to attack rolls?

Heh, you mean, like Loading?

I guess you could do something like requiring that weapons with Loading must spend a Bonus Action to attack while prone. This also inherently slows down the fire rate of CBE spammers.