A grateful 'Thank You' to everyone who replied to my posting regarding my model 1999 Krag carbine shooting 2' high at 50 yds. Each reply made me feel welcome to the forum.
Obviously, my powder choice of IMR 4198 was "way off the mark".  I have since loaded a dozen rounds each of slower powders behind the 180 gr Hornady Interlock RN bullets as follows:

IMR 4350 - - 34 grs.
R/L 15 - - 32 grs.
IMR 4895 - - 28.5 grs.

These loads have been reduced by 15% versus the starting loads listed in Hornady's Reloading Manual because I don't want to put too much pressure on the old girl.  Yesterday, my son and I went to range to test these loads at 50 yds.  However, the range had been rented out to community group for a Turkey Shoot.  So, I plan to be at the range on Tues., 11/26 to test these loads.  I did not have any 4064 powder on hand, nor could I find any at Cabelas.
Please let me know if any of these loads don't make sense to you.  I can always pull the bullets and adjust the powder charge.  I will report my test results within a week.  Happy Thanksgiving to You and your Families !