One of the big reasons Dave used the 9.3x62 case necked up to .375 is at the time there were very few 9.3 bullets available in America--and the 9.3x62 case had a little more powder capacity than other factory cases on the basic .30-06 case.

But now we have a great variety of fine 9.3mm bullets. So why screw around with wildcats?

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck