[Hannes665]

Then there is the fact that a Glass is not same as the next Glass.

I have dropped drinking glasses from 4 feet some crack other go into million bits while other dont even crack. Type of glass varies, for example a window.

TL 5 window, single sheet would easily crack while a TL 8 glass window multi-sheet can withstand a golf ball´s direct hit from 10 yards with a Iron 7 club. (My own personal accident).

Also there is always the option of using common sense when it comes to shooting glass bottles, you hit it breaks unless you are shooting a 22LR from a rifle at 10-15 yards and the Vodka bottle you shoot just falls over, happened to me not once but twice, took 3 shoots to break the bottle.