rl33 is just fine, rl50 is rather compressed by 2900 fps and 98 grains, by 3000 fps and 102 grains it is **** 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.
db