WE shot the plastic case with big buckshot, IE, 45cal lead balls at 140 gr
each. One load 7 shot 980gr at 1800 fps.. Other load 9 shot 1260 gr,
1600 fps. Some case expansion, these are about maximum loads at peak
pressure of about 12-13,000 psi, without case expansion ruining case.
WE use slower than shotgun powders which is easier on the cases,
but yet we use more for longer taller pressure curve, gaining some
velocity. Interesting case,, It is a shame they don't
have a metal base cup like the 8ga Kiln cases made here in US.
Then they could handle 20,000 psi.Ed