dont know, with a little patience and practice you can hit target at 100 meters with your faust easy, and with the piat with some luck . It is possible
been there, tried that… maybe it is possible if you can it it from the side, with a 0 Percent eangle, but when its parked 100m or more behind the gray zone, you only have the front to go for, or you will die in the gray zone. And guess what, the MG is shooting you from the front.
Also, both angle and distance reduces theise weapons penetration chances.
Good luck with that.