Steve..... You can use the same data that is available for the STS or Nitro hull. I have loaded thousands of those old "Green Weenies", and am still loading some today. You just can't wear them out. Best factory trap shell ever produced, in my opinion, exceeding even the older Winchester black "AA Handicap" shells that we used to shoot..... Dan Thome (Trap2)
Good news/Bad news - Those Premiers had a thick rim just under the crimp. With that rim they last forever. That's the good news.
The bad news is that rim made it a PITA to insert some wads. You'll get a snap and spilled shot. Remington's Figure 8s and TGTs are the worse. Some others at well. I've found the Green Dusters (1 ounces) and WTA12s (1 1/8 ounce) go in like Flynn. Others may as well.
Here ya go Steve. Remington Premier 12 GA. 2-3/4". Looks like the the data is the same as the new hulls on one, and within a couple of tenths of grains on the others. This loading manual is from when Clays first came out. Not much data then.
The old RXP and the Premier Hulls can usually be loaded using the data intended for the STS, Gun Club, etc. I have sectioned some of these hulls and the internal dimention are about identical. I was told by two different powder manufacturers that the data should be just fine to use for the older hulls. I would just add a line of caution, that you should stay away from the very highest pressure loads. I don't load much over 10,000 PSI or 9500 LUPs. I keep my pressures around 9000 or so for the older hulls. Old plastic, metal, and time might have caused a little weakness. I've loaded many thousands of the older hulls recently without any trouble. I think they outlast the newer hulls by a slight margin.
If you use a manual pull reloader expect a lot more handle effort for the Premiers. I loaded up 200 of them yesterday. There was about a half dozen STS mixed in. It was easy to tell when the STS went through the crimping station.
The data you posted has two Federal primers listed. The Federal 209 and the Federal 209A. They are not interchangeable. If someone uses that data for a reference, be sure to notice the difference. The newer Federal Primers are the 209A. There can be a big difference in pressures, so be careful.
I have a good supply of the older RXP and the Premier hulls. They are tougher than the newer hulls and seem to last longer. Loading data for the STS, Gun Club, Sport hulls all seem to work. I've compared a lot of the data and it appears that most of it is still valid. Some components are no longer available or have found less popularity, but the hulls appear to be almost identical in dimensions to the STS type hulls.
Quack shot, you are right. Notice on the 7/8 load with clays, pressure is 700 psi higher using the Fed 209A with the same amount of powder. They also list a Win AATP. That Win Target Primer was also hotter than a Win 209.