What was the original caliber ?
It is my .257SLR based on .280 Rem and .270 Win brass.
Weatherby magnum ? Bolt face diameter ?
No. .470"
Presently the rifle weighs 6lb 13oz with a Pac-Nor .25 caliber barrel and a Swarovski z5 BT 5-25X52 in extra high Talleys. It's been fired about 600 times and is still a one minute performer with it salt bath nitride barrel.