My favorite recipe for 7/8 oz. loads is:
Remington Premier STS hull
Remington STS 209 primer
19.5 grains IMR PB powder
Claybuster CB1100-12 wad
4300 psi at 1145 fps
The same load in a Winchester AA hull reduces the pressure to 4200 psi at the same 1145 fps.
These are published recipes from the IMR booklet. No fillers are necessary or needed. They are very mild and clean. I shoot these loads in my damascus gun as I like a good margin of safety and have never had a blooper when shooting them in near zero degree temps. (I do keep the shells indoors until I go out to shoot in these kind of temps as I have heard reports from others that very load pressure loads in very cold temperatures can lead to bloopers).
