The only Weatherby I’ve had experience with is the 257. I noted that brass only grew by .004” on the first firing. ( rom to shoulder). I thought this pretty good.
The Winchester and Remington belted mags would grow up to .020” on the first firing. Not so great for case life.
I seem to recall that Weatherby rounds headspace on the shoulder rather than the belt ( correct me of on wrong) . A definite plus for case life.
