Hutch,
The measurements you provided work out to .2675" and .2535". This is a pleasant surprise that means you can use standard 6.5mm bullets(.264). I believe Hornady makes a .268,which would also work. This would be for the 6.5x52 Carcano,so it may not expand much at the 6.5x70R velocity and may be heavier than you want to use.
Mike