An interesting scan through this thread, I've had a .257R as my go to for best part of 40years now, a Medium Action BSA Hunter with a worn out 7x57 tube, Din Collings rebarreled it into 257x57 with a slim 22" Douglas barrel. I asked him to throat it to allow for seating 120 grainers right out to mag max, ie 3", he erred on the generous side & I ended up with a bit more free bore than I'd reckoned on but the plus side was I found I could use 257 Improved data pretty much. I've recently bought some 110 gr Hornady ELD-Xs to have a play but in real terms, I've enough 120 Speers & Nosler SBs to see me out I reckon. I haven't shot anything but paper with it for years but prior to that it did all I asked of it.
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