Are those what they call specialty "gas seals" for police and military use? I can't quite tell from the pic.
These:
https://www.ballisticproducts.com/HB...tinfo/072HB12/
If so I tried to order some of those a while ago from the Canadian BPI rep but there was some confusion as to whet they were even though I sent the part number. I suspect he'd never seen them before.
Not sure what their special purpose is and since they say gas seal but have a central hole I have to think they are for use on slugs but...? I really don't know.
For full bore loads they'd work as donut wads though as Ajay says, the hole might have to be opened up a bit, and the 20 ga. version might work for two ball loads in wads but they are a bit thick as ball separators. Two 0.600" RB's fill my deep CSD wads. I might get a nitro card wad between them or maybe thin felt.
What I want to try is those attached to the tail end of my TC HB slugs to Brenneke'ize them. The 16 ga. version might work well for my Brenneke'ized Lee slugs too. I should buy some full bore, 16 ga. for the Lee slugs and 20 ga. for donut wads under RB's.
I got to get organized and get an order in to BPI!
Longbow