size up 7saum to 300 saum?

[wildwilderness]

I just picked up a 300 saum as a donor rifle for a build I am thinking about. Its a Rem M7 in 300 saum. I wanted to try it out as a 300 saum first just for fun, but can't find local ammo, and would want to reload anyway to test it out. I have a 7 saum and lots of brass, so my question- Is there any problem if I buy a 300 saum die to just run the 7 saum brass through and reload it that way?

(don't want to buy brass if i don't want to keep it as a 300)