I'll try a better picture

Thanks for your reply, unfortunately I only have 20
rounds of brass and when the first one chambered in
in the rifle I resized them all. I did chamber a resized
one in the carbine and it closed but it was tight. I usually
clean the chamber and bore on new to me milsurps but I
haven't cleaned the carbine yet so maybe it's just dirty.
After I fire these rounds I will try a fire formed case in both.

Amen to that!

I anneal my brass and size only enough to ensure easy chambering.  My cases fail when the neck splits which is the part worked by neck sizing.  Even with annealing sooner or later the cases fail, nothing last forever.  You can also neck size with a .308 Win die, adjust it so sizing stops at  or just above the juncture of neck and shoulder.

I use a .303 British, Lee collet die. Turn down the mandel if necessiary, using a drill press with emery cloth, to get the bullet tension you like.

John: How was the accuracy of your 'carbine'? Do your fired cases appear overly stretched in the Head area?

IMHO - Since your carbine appears to have a more generous chamber than your model 1898 rifle, You should relegate those fired cases to future use in your carbine and neck size only (to avoid needless over-working of the brass). Simply back-off your resizing Die a turn or two.

I find that most Model 1898 Krags are pretty tolerant and will feed a good variety of bullet weights and shapes. Over-All-Cartridge-Length seems important to Krag cartridge feed. Bullets should be seated out as far as practical, allowing for sufficient neck-tension and function through the magazine. The bullet nose contacting the magazine 'feed ramp' helps with directing the loaded round into the chamber.

Many magazine feed problems seem related to dirt, gunk, and dried grease in the feed path or carrier/follower arm assembly. Thorough cleaning and light lubrication resolves this. Another  possibility is a damaged (dented) or wrong (model 1896) side-plate on a model 1898 Krag.

I am attaching a picture, showing how, the follower/carrier extends out of the side of a Model 1898/99 Krag, with the side-plate removed. It also shows the Gate Hinge-Pin, rotated, to expose cam & spring tip for lubricating. You can always try your rifle's side-plate on your carbine to see if it solves the problem.

I worked on the magazine this morning. In the first pic the follower is out when I closed the door. In the second photo I pushed the follower back with my finger and it would hang up. I cleaned it and oiled it well and it is functioning much better. I'm still having problems with the plastic tip on the AMax catching on the feed ramp. I may just have to use a round nose or a flatter nose bullet