Thread: Resurgence of interest in the old "Three Oh"?

Just checked with Hatcher's notebook. He gave the .303 bore as that with the grooves 0.0058 deep so the grooves would have been .314 to .315 inch as noted. The lands and grooves were equal width rather than the very narrow US style lands. Hatcher would certainly been aware of the reason for the wide lands (erosive cordite propellant) and the oversize groove diameter (providing space for expansion of the projectile as it was forced into the wide lands). It is a pity Ruger was not up to speed.
Grandpamac.