std7mag
Well-known member
So then neck up 6.5-284.This would be taking .284 win brass and necking it down to .277, right? By pressing into a resizing die? I like the idea of a .270-.284 but seems this would be complicated as you already need a custom-made die set before forming brass. And I've never tried necking down, but I do know how easy it is to buckle a casing at the shoulder when I've gone too deep with a neck-sizer.
Quality cases available too.
And i already use 7X57 Mauser cases necked down to 257 Roberts, so your case colapse theory is a non issue.