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Were it my rifle I would stay traditional Brit and go with a .375 Flanged Magnum. Basically the same as a 9.3x74

Now if you don’t want to hand load the 9.3x74 seems a better choice just because availability of the .375 could be very hit or miss.
Of course it also depends upon whether the maker will do one in .375 Fl Mag?

Just my 2¢ (or 2p)
- Mike

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The .360 No 2 Nitro Express is a rimmed, bottlenecked cartridge designed for use in single shot and double rifles.[1]

The .360 No 2 Nitro Express fires a .367 in (9.3 mm) calibre, 320 gr (21 g) bullet at a velocity of 2,150 ft/s (660 m/s).

https://en.m.wikipedia.org/wiki/.360_No_2_Nitro_Express

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The 9.3x74R is of course more practical. Much the same ballistics? Maybe this .360 is slightly more powerful.

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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Am thinking European calibre because in my head o/u sits there. My BOSS battery has a 5.6x50
r o/u. Page 206 of boss & co Donald Dallas book shows a 375 h&h o/u rifle. I want a gun built on same lines. Calibre not sure your thoughts will help. This is my last gun. Let’s hope my estate doesn’t handle delivery.

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C's commissioned rifle will be a Boss under and over double rifle. Prior to C's U/O rifles,he mentioned to me Boss had made only the mention .375 back in X.

IF it was mine, and a Euro calibre, the following COULD be choices:

the obvious and very useful 9.3x74R;
that cartridge necked down to 8x75R;
something I wouldn't choose, a 10.75x68 Rimmed - does it exist?
the modern .500/416 NE;
many medium rifle choices.
I'm sure there are other choices?

Imperial choices:
a .450/400;
something I would choose, not having one, a .375 Flanged;
matching the .500/416, a .416 No.2 Rigby;
I would be attracted to the .333 Flanged Jeffery.
Lots of larger medium bore rimmed choices.

C feels an U/O is less suited to a very large bore, and is more Continental European. Maybe the Ferlach gunmakers might disagree on the first?

Another complication for C is he likes to have the BOSS serial number to match the calibre e.g. 10375, 10600 etc. The prefix 11### might be an option. A shotgun and rifle can use the same Boss serial number. One of C's rifles wears the same SN as one of Eric Clapton's shotguns.

This rifle would be the final order of C's 15 year, so far, Boss project.

Keep suggestions flowing.

I like the .333 Flanged. A 300 gr .333 at 2200 fps is still very effective. I would get an assurance from Geoff McDonald that he will resume, one day, making projectiles for it before commissioning a new rifle though first. Useful without projectiles for hunting. Bertram makes useful .333 projectiles for ferals and targets as well.

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John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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There is a Westley Richards Ovundo in 9.3x74r built for maharajah on Egun. It is spectacular.

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Probably originally was a .360. Lots were rechambered.

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John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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