Hello again from central Massachusetts, sight of the first Thanksgiving, 398 years ago. Google that and see what the Pilgrims and Native American ate... it was quite a spread !
Yesterday. my son and I went to the range to test the 3 new recipes of slower powders for my 180 gr RN leads.  Those recipes are listed in Reply #7 above. The results were encouraging in that all 3 recipes' POI was only 12" above the bull's eye... much better that the 24" high POI I got using the very fast IMR 4198.  I tried 4 rounds of R/L 15 at 100 yds. a the POI was about 11" high.   With these results it seems to me that I have 2 options remaining: (1) Install a higher front sight blade, or, (2) reload using only 220 gr RN bullets.  I am pretty much a purist, and as such, I don't want to install a non-original parts on the carbine.  Also, I know the 30-40 Krag was manufactured to shoot a 220 gr RN bullet, and I am thinking the factory sights are calibrated for that bullet weight.  I am thinking that if a 180 gr bullet shoots 11" high at 100 yds., a 220 gr. bullet  might shoot only 3"-4'' high at the same distance.  If it were to work out that way, I could certainly live with that.  Again, as always, I will appreciate any counsel and advice you can provide.
Lastly, on the Forum's website, I can not find any instructions on posting pictures; I have taken pictures, uploaded them to my PC and would like members to see my carbine.  Also, I would like to know how to save an unfinished post that will be completed at a later time