I've been laid up this week, so I'm late coming to the party...

A friend of mine uses 150 gr rn bullets in his Krag loads for CMP matches.  I'm not sure if he's using 4350, 4895, or 3031, but he regularly shoots 296 or better... which is amazing in anyone's book!  When we discussed using the 150s, we talked about my using the 4350.  I also tried to work up a load with 4064.  Unfortunately, I could not get the accuracy I wanted with the lighter bullet (remember, not all Krags like the same food), so I'm back to 220 gr. 

Hope this helps.