Hell, launch one of them 700 grain .50s through it!
, I know damn well my 50 with 750ggr grease groove bullet would penetrate that drum, would most likely wreck it to the point of not being able to patch and use it again, we'd have to get approval from Dan before we trash up his 45-70 thread talking about the 50-90 Basher ; ]
At 25 yards the 577 Nitro with 750gr Barnes TXS at 2075 fps pulled the threads on the filler lid, it came dancing back to me on my right, blew the main clamped on lid, spilt the drum at the seam and put a big dog knot in the bottom of the drum, the hygraulic/displacement? or whatever it was has to be seen to be believed.
