Alliant did have 3/4 oz data in years past. RD, GD, and Unique were used for this data. I emailed them awhile back asking why it had been discontinued from the manual. Their answer was: lack of interest. They said it was perfectly fine to continue using that data.
I use Promo (RD) for some 3/4 oz 20s, though I prefer GD. A friend had the load pressure tested by Tom Armbrust and it was quite acceptable.
I use the same load data (plus some puffed rice) for 5/8 oz 20s that my 10 y/o son runs through the 391. No, they don't cycle the action.
Sam
