So that kills the next guess of a 375 Cheyenne tactical 
Getting closer 375 H&H Magnum?
lol, yeah, not a cheytac 
still little smaller than a 375 H&H and not belted.
bullet diameter bigger than 8mm and smaller than .375 but named in British style on land diameter not groove diameter.
OK, I have narrowed it down to either a 350 Rigby or a 318 Westly Richards
Yep, a .318 Westley Richards or 318 rimless Nitro express
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Is it a Weatherby of some description?
scratch the 17 rem, neck not long enough. is it a 17-223 Ackley improved?
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Spot on 17-223, your up.
Is it a .50 Beowulf?
it sure is.
Is it a 458 cal ?
No it is bigger
Is it 20mm ?
no lot smaller than that. Closer to GUN-DMC guess.
I would love one of these. Brass from parent case a bit expensive though. Will let someone else guess this time.
I’ve often wondered if the bloke who designed this just has a very warped sense of humour, or is actually troppo. Does he have a bunch of gullible mates to try out his newest design, like “Hey John, give this one a whirl, I’ll just stand over here” Some of his other stuff is insane without a doubt!
So its some kind of .50 then im guessing?
This one has got me stuffed!