I used Buckshots advice to start with 8x57 data and work up from there. Using medium traditional burners like 4064, 4895, 3031 starting in the 40-41 gr area seems prudent. I don't have my data in front of me, but it seems like I was in the 42/4064 area when I last played with it. For charging rocks or scary paper targets, 16/2400 is a nice plinking load. I tend to think of this round as a 33 or 348 Winchester in a bolt gun. I haven't done a recent search for data, but that's where I'd start. That case is not like much else around, more like a straight wall than a bottleneck in some ways. It can use slightly faster powders than you might think. My bullet is almost 20% heavier than Lees, so I'm in a different ball game. I did recently look at NOEs website (IIRC) and he offers a FN 230-240 gr GC design that looks like just what 'm aiming for. Mine is a well tapered RN and while I'm sure I could bust both shoulders on pretty much anything in the lower 48 with a 240 at 2-2.3K, I have a great deal of trust based on experience using a major FN cast design in any caliber I've tried it in.
Lovely little carbine, isn't it? I'm thinking about working on mine over into a less military appearance, but it's #53,698 on my list of top gun type stuff to do. It's gonna be a while!