My question is this.... I have read here that data/recipes for Remington STS, Gun Club, and black Game Loads are basically the same. I have a large quantity of older (early 1980's) RXP 12 ga. hulls. These are in excellent shape, and I hate to throw them out. Would the same data apply as for the other, more current hulls?
Any information on this would be quite appreciated. I am reloading lower pressure target loads (1oz., mid 5000's PSI), primarily for older double barrel guns.
Conventional wisdom on this forum is that any Remington 12-ga 2-3/4" one-piece plastic shell can be reloaded with the the same recipes to produce the same results of pressure and velocity. This includes the current STS, Nitro, Sport Load, Gun Club, Shur Shot, Game Loads, blue Gander Mtn-Peters, and some Express hulls, along with the older RXP (blue and green), Blue Magic, Peters Target, and Premier hulls.
This opinion is reinforced by the grouping together of recipes for the STS, Nitro 27, and Gun Club hulls on the Hodgdon site's reloading data pages. Alliant groups together with the same recipes these hulls: "Remington Plastic Shells (STS, Nitro 27, Premier RXP and Gun Club)".
The only caution might involve using a recipe in an older hull that is published as a maximum load in a current hull, and vice versa.
This is not a problem for you because you're working at the opposite end of the scale, trying for minimum recoil (velocity and shot weight) and pressure to avoid battering the older guns.
Lyman's Shotshell Handbook
third edition lists a number of one-oz loads for RXP hulls specifically, on pages 154-155. Contrary to a post above these are not all fast loads; about nine recipes are shown for velocities of 1200 fps or less, with pressures in the mid-7,000 lup range and less.
(By the way, nice shell bags!)