RST powder in their lite 2 7/8" 10 ga.
 

Does anyone know what powder RST uses in their lite 1 1/8-1 1/4 lite 10 gauge loads? It is approx. 25 grains of a very small flat spherical powder. Also, anyone know what powder they use in their lite 2 1/2" 20 gauge loads. It is also a very small flat spherical powder?

I would think that the powder RST uses in their loads would be proprietary.

Manufactures have access to powders and components that are often not available to reloaders.

The powder could well be proprietary; however, with the cost of R&D for powder development I would be surprised if RST is the only market for the powder manufacturer. It may well be a powder that is no longer in production due to a more modern or cleaner version being marketed but neither of the two powders look like what I would envision as a shotgun powder.

I use Clays exclusively for Sporting Clays practice and also Universal Clays for small gauge. If you have a good low pressure for 2 7/8' 10 ga., I will drop it back at least 10%in load develop[ment and try it. Thanks Jim Garrett

Have you tried loading them with Fiocchi 616 (209 Type) primers? They are .004 larger than Win, Rem and Federal primers. They are on the cool side of primer spectrum close to Rem STS.