Originally Posted by Lefty7mmstw
rl33 is just fine, rl50 is rather compressed by 2900 fps and 98 grains, by 3000 fps and 102 grains it is damn compressed but it still holds length(when left to sit for a spell) and shoots as well as 98 grains. I'm switching to rl33 for the heavies on it if they chrono well. Even at 3K fps rl50 is a rather mild load with the 225 in the rum. I hope rl 33 is faster as it seemed snappier when I shot them side x side. The wind was up too much last fall when I went out with the rum and rl33 to chrono it. I don't want to buy another chrono stand.
When Matthews built my RUM, I don't think 33 and 50 was available yet, at least I don't remember them. The slowest I did try was 50 BMG, a new powder, but could only squeeze about 102grns in the case if I remember right. My rifle didn't like Retumbo. I would like to try 33, may give a little more volume. Thanks for the ifo.