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Found a Yankee site selling wad cutters for all sorts of catridges. Their 12g one is 0.735" ??

I think I used Eley plastic hulls.
Here's a couple of photos.
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Cannot understand how my Pinex is 12mm as it well and truly predates metrics.

I also loaded 16g but have no memory...

NAKED_GOOSE Just found the remainder of my old wads. I'll photo a phot and dimensions.

I think 25 mm is the old thick Pinex, not the Michelangelo version of ceiling tiles.

To make the holesaw into a knife rather than a messy ripping saw. Effectively a rotary wadcutter like my mate's.

The cutter I used belonging to a mate was specially made to cut 12g wads. Back then those sorts of things were available. It had a sprung centre plunger that popped the wad out once cut. Even if...

Yep, those tiles are thinner than the older original Pinex I used. Would need to put in maybe an extra wad. As far as using a 22mm hole saw it might work if the teeth are removed by grinding down...

I used to use ceiling Pinex. Can you still get Pinex though? Mate had a special 12g cutter that you put in a drill press for making wads.

IIRC I had one thin stiff overpowder wad (cut with correct...