If you get a gun with a sporter weight barrel you most likely will need to widen the channel (not a big deal with a wooden stock and still pretty easy with a synthetic - just wrap sandpaper around the right size deep well socket and...). If you get the 300 Win mag it will have a heavier barrel and the channel would probably work but then you will have to change the bolt head too.
I have a 375-06AI barrel from PacNor on a 1917 that is great with cast and jacketed bullets - great cartridge.
Also have a factory 116 in 375 H&H - great gun but the bigger case isn't as friendly with cast loads (unless you were wanting to use black powder!).
Why are you going with 375 for the cast bullets instead of 40 or 458?
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