Chasseur,
Having never loaded for the 9.3x74, I cannot say...but IMR-3031 is very close to the same burning rate as IMR-4064, but every gun is an inity unto itself, so I have no doubt of your problem, just suggesting some possibilities. but you have to admit these forums are a good place to discuss these matters and a lot of hard questions are answered here, so no one is trying to start an arguement that I know of but varied opinnions are good for the soul.....