Mike, I believe the RST's are Cheddite hulls. Unfortunately I don't see any recipes for using PB podwer.
There are plenty of loads using Remington hulls and if you cut them to 2 1/2" and roll crimp them, the same loads for 2 3/4" on the Hodgdon site will work with 3/4 oz. and 7/8 oz. loads.
For the last 2 years I have been loading 2 3/4" Remington Gun Clubs, using Titewad powder, Claybuster 0175-12 wad, Winchester 209 primers and they are a very nice load. As others have stated, if I do my job, they do theirs and at a remarkable distance with good speed.