I bought three sleeves, used two bricks and sold the rest.

Problem was puncture. About 3% of them would punch through.

My Brownings were the worst culprits, and I've been advised this problem is gun specific and I'm just unlucky. What a load of crap.

The metal is thinner, and the cap is more sensitive. Might be just the thing for old guns with less than modern hammer speed and perhaps fine for round and wide firing pins.

Not for me. I pay an extra penny and use Winchester.

"The price of good shotgunnery is constant practice" - Fred Kimble