Bob, I've been following this thread and decided to take a closer look at one of my '98 Krag sporters to see how it feeds.  I laid my rifle on its left side and opened the magazine door.  I inserted 4 cartridges and put just a bit of finger pressure on the last catridge while cycling the bolt.  They all picked up and fed smoothly.
My point is that by using gentle finger pressure if there was a hang-up I'd be able to see and feel where it's happening.  Will yours feed if only using finger pressure instead of closing the magazine door?  If not, you might be able to find the rub.  If they do feed, there could be follower issues here.
By the way, mine is able to feed 150gr SP Spitzers.
One more thing, from reading your earlier thread I couldn't tell if you ended up actually removing your cut-off lever and cleaning any gunk out of the hole.  Any burr or hardened grease in that area could be causing the cartridge to hesitate.