Re: 300 - 338Lapua
The 30-378 is more gun per-say, the problem was good powders. (few choose's) to fill the case
It holds more powder, So it was hard to utilize the case. even the good 30 cal bullets were not ideal, it just is at the edge of what was avalible for components.
Howard Wolf use to shorten the 30-378 case for his bench rest gun, quite possible before Kirby was even born. "He is a 1K hall of famer" the 30-338 is close to what he shot just modern components. This is my understanding anyway. maybe Kirby knows for sure?
As buffalorancher said, The 30-338 holds less powder.
It has more powder choose's, is more friendly to work with, better brass, etc.
It is a great 30 cal platform, very accurate, now we just need some more bullet choose's like some 230 gn VLD, 250 gn tungson, maybe a few more powders too. LOL
The new components coming out should really make the chambering outstanding. Then maybe we could actually buy loaded rounds, but what fun would that be?