I have an old Brno 602 with a 375 H&H magazine box & follower. I have a new take off 375 H&H barrel that I am going to have installed. I already have a couple 375's so I don't really need another.Was considering having the barrel re-chambered to either 375 Wby or 375 ultra mag.The H&H magazine box should fit the Wby rounds and feed just fine. Not sure about the RUM. Anyone have experience with this?? Do I need a larger magazine box?? Will the Rum feed without a lot of work? I would appreciate any input.

375 weatherby should feed fine. Rum might require tuning

If you want tomgom.458, I have a barrel for sale that should screw in, and have timing set, then chambered for a big bore. (shameless plug)

My ZKK 602 was an H&H rechambered to .375 Wby.
Nothing modified other than the reaming work.

Thanks for your comments gents. I would have thought someone would have opened one of these up to 375 Rum and would have some comments.