I think with H4831 you'll run into about the same as I did in my Krag when I compared it to RL19 and the boosted WC860 using 150gr FMJBTs.  Even with the longer Krag barrel, it really didn't get up to pressure and gave me a lower velocity as compared to the other two.  Didn't group as good either.  I used the #34 primer in all the loads.  That was the SC also.