That's interesting. I have a couple of 2 7/8 inch 10 G Doubles. Called Polywad and found they don't make a 10 G spreader disk but recommended using a 12 G disk instead

Patterns with the 12 Disk in a 2 7/8 inch 10 G shell may be the best spreader patterns I have seen. Of course it helps when they throw 1 1/4 oz of shot. The guns are choked very tight and the disk helps a lot on Rabbit targets. At least I think so which is half the battle.

Boats