Fiddler wrote on Jan 1^st, 2018 at 12:45am:

I've had excellent results with 311467, 311284, Lee 180, NOE 311-174 ELCO and NOE 310-196 MX2-30H. They are all capable of 1 1/4" to 1 3/4" at 100 yds. My bore is .310 so I size them large and a bore riding nose dia. is a good thing. The powder selection has been 2400, 4759, 4064,  Benchmark and Varget The NOE 310-196 will not feed in my rifle, the others are OK. The rifle has a 1902 sight and the front blade has been replaced with a home made, higher post with square corners.

May I ask what load you tried the MX2-30H with?  I have had great success with it in the 300 Blackout and had thought to try it in the Krag along with a couple of others.  Sorry to hear it wouldn't feed, I'm hopeful that won't be the case with mine, it just flies so nicely at moderate speeds out to 265 yards.