Looking at case dimensions between the 50-140 and 50-90 it seems as though I can get away with using the 50-90 dies to reload my new 50-140 rifle. I think I'll only neck size to the depth of the bullets I'm using, anneal and bell accordingly to keep the brass life up. This rifle is a Navy Arms Rolling block barreled action they produced years ago. I need to restock it still and buy some more brass as it came with 20 original pcs of C. Sharps brass which is worth more to collectors than it is to me even though its not original brass.