I have a chart that shows typical pressures as the bullet moves down the bore from a rifle company. It drops dramatically as it moves - that's why the muzzle can be so thin on some barrels and not cause problems. When you are using hydraulics the entire bore is holding the pressure - completely different then firing a bullet. Secondly, how much pressure can "your" barrel handle before a bulge forms? I'm sure there are rough calculations, but without actually trying it it's hard to be sure. As I said earlier, I would try every other possible method before turning to hydraulics. I too am not interested in arguing, or trying to prove anything - these are just another guys $0.02
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