Re: Oh wise reloading masters,Resizing brass for 7
I experimented with making 25-06 cases from 30-06, 270, and regular 25-06 brass this year. It's similar to what you're asking. When all was done I came to the conclusion that the only benefit to be had from resizing brass was in the case of using high quality brass. In your case the only benefit I would see would be if you used Lapua, Norma, or other match quality 308 brass and resized it to 7-08. The brass would be a lot more uniform if you wanted to take the pains but with the average hunting rifle you'd probably never see the difference.
By resizing brass you can wind up with cartridges that have larger neck diameters and more closely fit a factory chamber which will help a little. I was only able to gain a couple of thousandths over the factory brass and really didn't see much improvements. That said though, what I'm shooting now in my 25-06 is 30-06 brass that has been downsized in two steps to the 25 caliber and results are good. Of course headstamps are wrong and you don't want that ammo falling into the wrong hands.