I just picked up a bunch of new 270 Weatherby brass at a yard sale. My question is can I make 257 Weatherby brass out of it by running it through my 257 die ? Thanks!
Yep, this is how I got my first batch of 270 Weatherby brass, reformed 257 by running it through my 270 Weatherby die. In essence, you're just resizing the neck.
Cheers.