I've used those hulls. I found a load in an older Lyman manual. The main problem with it is that it is very dirty (and a bit loud). No problem for hunting, but you have to clean off the barrel flats often during a round of sporting clays. The load is intended for 2.75" hulls, but I trimmed them down to 2.5" and roll crimped them. Recently, Ballistic Products had some of the paper Cheddites in 67mm instead of 70mm, so no need to trim for short chambers. Anyway, the load is:
24 grains Blue Dot
RXP20 wad
7/8oz shot
Ched 209 Primer
Pressure: 7300psi
Velocity: 1259fps
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