Ian McMurchy has done so. I read about it in American Hunter. He did 9 guns total. He dunked a loaded primed gun (from various manufacturers) into 2 foot of water for 10 minutes. He emptied the water out and attempted to fire the rifle. For every rifle that passed he kept increasing by 10 minutes every time. The winners were Knight Wolverine 209, Disc Extreme, T/C Omega, Black Diamond, and the Encore. No non-American gun passed and a few american guns didn' t either.