A wee bit more would be perfect, just so about 65% of the case wall thickness is biting into the bullet. The old .455 is a good mid-range cartridge and a proven stopper in military service. It will do anything the .45 ACP will do, and the old military (now outlawed for many years) Mk III hollow-point 'man stopper' was a devastating 'flying dustbin'! It was developed for stopping drug-crazed Dervishes in their tracks but was outlawed by the Hague Convention before WW1 (along with the MkIV hollow-point .303).
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