I have used the 7700psi load and find it very pleasant to shoot. The data I have is from the Alliant Powder reloaders' guide dated 2002 and shows using only Rem. Premier plastic target shells. I loaded a few shells using game load hulls and found there to be a noticeable increase in felt recoil. I've been told that the Premier hulls and the Gun Club hulls can be interchanged as they are constructed the same. Be safe and good shooting, CGS