I use my 358 win dies all the time for my Winchester in 356 Win. I have a lot of 356 stamped brass but have also necked up about 100 307 win brass. I simply run new 307 brass through the sizer, load and shoot. Haven’t really noticed any accuracy differences. My 356 Win is a consistent 1.5 MOA gun with 200 grain loads. It’s one of the rifles I’d never sell. I bought it with less than a box of rounds down it in about 2017.
Are you shooting a Winchester or the rarer Marlin?