It is my understanding that there is more work required to go from 375 to 404 as the bolt face has to be enlarged. With the 300 RUM to 404 the bolt is fine as-is, and the feed ramps should be fine as well, along with the magazine set up to hold the same size cartridge...just a new barrel is...
First post. I'm reading through this entire thread...currently on page 21 of the 73.
I'm working my way up in caliber...my story:
I really got into 358 winchesters and shooting cast boolits. I have 3 358s currently (Stainless and blued rugers and a really nice Flaig custom 1903 that I had JES...
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