Re: 7mm remington magnum
When I got some of the first RL-33 available well over a year ago I tried it in a variety of rifles.
Here is what I wrote in my documents regarding a 7 Rem mag:
7 Rem Mag: 24" Rem barrel, Win brass, Fed 215, moly coated 162 A-max seated .010" into rifling.
Original accuracy load: 72 gr of Retumbo 2975 fps
starting load 76 gr vel 2837
worked up to 79 gr for vel of 3000 for very small gain over Retumbo
80 grs showed a hint of lift and a small shiny spot on casehead.
I used a bullet seating comparator and noticed that even with the use of a 6" drop tube the powder was filling the case for a heavily compressed load. 79 gr and up caused the OAL to lengthen over .010", enough so the bullet wouldn't fit into magazine.
I can see why Alliant only mentioned a load for the 175 gr bullet.
If it is all you can get give it a try. It will work better with a 175 or 180 gr bullet.