It’s not cheating, it’s improvising and overcoming.
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With all the other guesses it was getting easy to narrow down! 
yeah I didn’t want to make it too hard, its best when it flows and its fun otherwise people won’t want to play.
I could post some obscure wildcat and have no-one ever guess it but that would just make me look like a dick, lol.
You watch too much yank TV
is it a 30 cal of some description?
7mm Remington magnum
Old Bloke is closer that DMC. Is a 7mm.
Give us a clue. Show us the head stamp
can only ask yes or no questions or make a guess 
I think it’s 7mm-08
Not 7x57 shoulder too sharp. I’m guessing
7mm short Winchester mag
Close but no cigar.
Not a magnum.
Very fat 7mm 
Shit. I hope i got the right pic!
28 Nosler?
280 Remington!
Nope. Older cartridge popular with long range target shooters.