I use the mostly H4895 or IMR 4895
powder, but I always download 3-5% or so from the manual. I have a ton of 150 grain FMJ pulled bullets that I've slowly been drawing off of. Accuracy is not great but still not bad for "battlefield accuracy", from a sandbag about 3-4 inches at 100 yrds is about the best I can get. These krag bores just dont seem to like light bullets. I'll make up some 200 or 220 grain loads on softpoints occasionally, and accuracy is much better with these....I've shot several groups between 1.5 in and MOA during different sessions, enough to make me believe the rifle can shoot better than I can consistently hold with open sights. Mixing brass seems to hurt group size, I normally sort for case neck thickness and the consistency is noticeable on target. The problem with the soft point bullets is that they get deformed or hang up on the sharp seam between the side plate and the receiver. A small piece of milk bottle plastic held over the seam with a piece of double sided tape seems to fix this problem.
4895 powder is great because it has the right burn rate for the M1 Garand as well.