Thoughts on this 375 H&H?

[Ontario Hunter]

You’re on the right track here. The custom sporter jobs on old military rifles are very hit or miss. You may get lucky and score the best rifle you’ve ever had for the price, or you may just end up getting to fix someone else’s mistakes. It takes some experience with looking at these and absolutely in person inspections to know.
I would trust the gun sellers at Walmart more than those at Cabelas…
As for the newest “innovative” designs, they bring nothing to the table in my opinion, sacrificing quality and tradition for cheapness, while advertising that cheapness as utility.

From what I'm reading modification to big bore CZ 550 is pretty much a prerequisite before they cycle properly. The military 98 Mausers are certainly strong enough actions (late WWII German production was iffy). My postwar Czech vz.24 turned out very well converted to 404J and that is by all accounts a trickier conversion than 375 H&H. I posted videos of me loading and cycling a full magazine. Flawless and slick as glass. Look for 98 Mauser with 3-position Model 70 style safety. Anyone putting that upgrade on their build project will be more likely to have feeding rails, loading ramp, and follower properly tuned for 375. But again, if you are interested in buying a second hand rifle, ALWAYS request vendor send you videos of the gun being fully loaded and then all cartridges cycled out. Do this no matter what make or vintage rifle.