A couple of years ago I bought a Weatherby WeatherMark Alaskan in .375 H&H built during the Japanese days.

It has become my lousy weather rifle. Great for times when you're going to get sop soaking wet or snowed and hailed.

It has fired groups smaller than bullet diameter with 235 gr Speers and holds 1.25" groups at 200 yards with 270 gr Barnes X bullets.

I don't think they are pretty ... but they are darned sure hardy and shoot very acceptably.

BTW ... the 340 Wby does recoil more sharply than the .375 and I do believe it is louder ;>

I just bought a Mark V action made for the 300 and 340, and I'm planning on building a rifle in 375 Weatherby with it

It's of Japanese origin (Miroku I guess?) and the owner told me that the trigger can be pressed forward to activate a much lighter trigger pull (don't know the expression of that in English ). I haven't received the action yet so I haven't been able to tinker with it.

I guess it should feed 375 Weatherby with no adjustments needed.

I have this exact rifle with a brake and the felt recoil has been rduced to equal a 270. Accuracy is not what I am use to however. Shooting offhand on ground or on a bi-pod I can keep all shots on a pie plate at 200 yards. But on a bench I cannot get good tight groups like I can with my 25-06. I reload and have set the bullets out as far as I can and still chamber the cartridge. I have been loading Woodleigh bullets but will try other bullets to see if this makes a difference.

I've got a 340 in a mark 5 had it for 10 yrs its killed both elk and moose just (like they were hit by lightning)
i don't have a muzzle break, it, has a gentry stock on it
I can shoot a box of shells off the bench in a t-shirt
with max 250 grn loads