M79 Sponge Rounds and Casing choices

[Rekraps]

Okay, so I posted an earlier thread about using aluminum cases for M781 chalk rounds, and how the impulse charge (full power) would deform the cases, making them one-pony tricks. Well, if you use the aluminum cases for sponge rounds with 1/2 power impulse (.38 1/2 loads), there is no deformation. Cases can be used forever. Note that the aluminum casings have a much more constricted expansion hole than the plastic ones, so even on 1/2 power the sponge round has an incredible velocity. Do not want to get hit by that thing.