Wads

[Kurt]

The material I use is "cut.a.gasket" part# 0217429. This is a very fine ground dense cork. We had a TSC close down in town several years ago where I used to get this particular material and I had to switch to the NAPA stuff that had rubber in it and I did not like it as well. Two years ago a TSC opened up again and they stocked the cut.a.gastet material again in 1/16" and 1/8" well I stocked up with again and get whatever is on the shelf when I get there. It's less than $8. a roll 12x36" to get 1000 wads from it.

Dave.

Just a guess. I think the soft dense cork expands when it gets pressure build up between the card wad whatever is above the cork it expands tight against the case wall holding the gas back better than the hard card as the brass case wall gets slammed against the chamber wall. The cork will expand were the hard card wont and let’s gas leak by.
I think the cork acts like a soft rubber ball sort of, when you squeeze the ball it expands.

Bruce.

Yes it's stretched Rem .45-70 brass. It holds a little more than the Norma brass I like to use for the PP bullets.