What is it being fired in to start with? If it is 240 or some other machine gun then........it is your call about resizing. From what I have read then the brass will have problems.
That being said, I would think that logically, you might be overworking some NATO brass from a machine gun and causing it to harden earlier. So you might get 2-3 loadings instead of 5-6 loadings, for example.
I would do it. For what that is worth.