Thanks, very interesting, it looks like the 270grs are getting around 1900 out of such a short barrel.
My barrel is still 25" and I'll start load testing with some 245gr hard casts and probably whittle the barrel down a bit as I go, mainly for feel and balance

Don't panic, its not a vintage rifle I'll be cutting up. I'm building it from a 1903 LSA actioned No.1 Mk111 'roo shooters rifle that was originally in 303-25....its had a pretty hard life up until now...

Roger