Since it is OK to link to Double Gun this is what got me started down this road a couple of years ago:
  (You need to Login
Looking through this thread I saw a reference to 35 krag loads but in recent searches I have not been able to find anything.
Parashooter,
I had already researched the PSI/CUP conversion and found it was not possible to do consistently.
On your chart with the software estimate pressures it has a 250 grain bullet and not the 220 grain I intend to use. Is that correct? If so then 45 grains of varget with a 220 grain bullet should really be in a safe territory. Even if I could get more I like the idea of a moderate charge as there will be less operator punishment and noise.
I have also given some thought to this apparent equality of the 308 30/40 at 40K cup and thought about the difference in the shoulder angle. This will become less of a difference with 35 caliber as there is a lot less shoulder remaining. I have a 308 case somewhere I will try to find it and open it up to verify.
Reincarnated,
You mentioned cracking a bolt with 41.5 grains of 4350? My son's Lyman book shows a load several grains higher at 40K from a pressure barrel. I know different guns will make different pressures with the same load, but I have a theory why some of these old Krags may be developing more bolt thrust with what should be safe loads.
On the barrel that I took off this gun the chamber was .010 oversize for some distance from the rim. Could it be the case can not swell enough at that point to grip the barrel and allows the case to stretch and slide back with too much thrust on the bolt?