My friend gave away his old gas propane tank (used in gas BBQ grill), empty of course, in fact he wanted to throw it away. I was glad to take it so i can shoot my guns on it to see for fun. My other friend has a private property in the country and im planning to bring this out. We will shoot it 35 yds away with a dirt berm as backstop . The guns im bringing are M1 Garand, Mosin 44, AK 47, 1911 and the lowly CHicom tokarev. The first three im sure will go through with no problem. But the slow 45 acp FMJ might not fully penetrate . Now the tokarev round is known to go through kevlar, that s what im excited to know. Whats your guess ? BTW 35 yds away bec i m concern of richochet. 45 acp and tokarev might go through like butter if closer at 10 to 25 yds. Again, what do you think. Propane tank is like 3/8 inch thick steel. Double that and be interesting to find out.