I reload a 2-1/2" 12 ga. to match the RST Lite shells. I've talked to Morris at RST and he would not divulge the load or manufacturer of the powder. I totally understand his reason and now I feel bad I even asked him. He has liability issues none of us even think about.
I do however use a load of my own concoction. It works very well in Vintage guns and generates between 1150 and 1180 fps . I use 22 grs. Of IMR PB, a 12ga Winchester gray wad for 7/8oz., WW209 primers. All shot sizes work well I like #9 or #8s for skeet targets and #7-1/2 for Sporting Clays.
I also use a Spolar loader which I had set up for 2-1/2” shells.
Hope this helps.
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