HA! most of us have more than 1 #3 and some a #4 or 5 - some have all - some like a freind, once had well over 100. I've formed .303's to every calibre from .22 to a straight tapered .408 (.40 Maynard - 1/10" short, I think) - just as an exersize to see how they'd look.

The .257 looks very nice indeed, and if improved, would have been a great one. I have a factory .303/270 (so stamped) and that and the knowledge of others is what prompted me to do this. Ken Water's .375/303 #1 also inspired this.

Some day, I'll re-barrel my only #4 to .35 and put an improved .303/35 chamber in it - what a wonderful round - 1/2 (or 3/4's) from a .358 Winnie a .350 Rem Mag. I figure.

Currently, it's a .312" Express (check Ken Waters book). I thought it was my wildcat, but he'd already done it a couple years ahead of me - so it goes - HA!. Mine runs 174gr. at 2,940fps - with moderate pressure by measure. 1 1/2"/100meters with new factory oversize 2 groove barrel.

I loved my .257 ACKIMP - so I'm surprised I don't have another - maybe the .35/303 will have to wait until a .250/300IMP or .257 International (to be different) comes my way. Hell - the standard, just like yours, would be a LOT less trouble.