RE: 270-08?
The only question that comes to my mind is, WHY? Why would you want to go to all the
trouble/expense to build a custom rifle that would use a 308 cartridge casing necked down to take 270 bullets? I mean, to each his own, and it would be different, but we
already have the 7mm-08. The difference between 270 and 7mm is only .007".
You would likely end up shooting the same bullet weights as does a 270Win. or 7mm-08,
but would just be the tiniest bit smaller in diameter (.277" vs. .284").