FWIW, Kent offers some low pressure 12ga loads in 2-1/2" and 2-3/4". I bought some about three years ago for a Brit hammer gun with twist barrels but have not shot them yet. Local SxS target shooters like those loads a lot. Fiocchi offers a 2/3/4" training load of 7/8oz #8s at 1200fps that is low pressure. I got the pressure info directly from Fiocchi, but don't remember what they said, just that it was surprisingly low. The silver box Win Super-X (made in Italy or Australia?) have a reputation for being soft shooting, but I don't have hard data on those. I have used them in older guns with great results. Gamaliel used to sell low pressure loads in 20ga from Clever, I think they were Mirage Featherlights, #8 at 1200fps. There might be a similar load in 12 ga. Gamaliel's sale to Brownell's, and subsequent separation of their retail operation has confused things (at least for me), but it's worth a couple of calls.
