Ok.. Let's go with a guess that cartridge game.

[BULLBLASTER]

I'm gonna make a request.To be able to make a real guess on these we need a view of the extractor groove.Otherwise it really is a guess.this one is a good one,I say it is a belted mag.with a 30deg. shoulder,neck down to unknown size.head appears to be same size as case body.this could be several cartridges but if we could see the extractor groove like a side view it would eliminate a bunch. 

That’s the point... it’s a guessing game... 

[elkinrutdrivemenuts]

There are to many rounds out there to keep up with these days.  I think the one on the right is a 280 rem.  left, who knows  338 caliber?

[hunter399]

275 h&h mag.

[bullfisher]

308 baer

[N7XW]

Can't you guys make this a little bit easier for some of us novices...you know, like including a photo of the headstamp? 

[yorketransport]

Cheytac cases aren't belted and that maybe looks like a 270 Win on the right so I'm going to guess 375 Hubble Express or something with one of its parent cases.

Or is it a 375 Lethal Mag?  Those would be my two guesses.

Winner! It’s a 375 Hubel express with a 280 Rem next to it. This is the next barrel after I smoke the 338 SnipeTac on the rifle.  I’ll get a picture up when I get home next to a couple more familiar cases.

[yorketransport]

Let's go one more round. For reference, the case on the left is a 30-06.

[Magnum_Willys]

Beltless, long shoulder, looks  like 30 cal. Hmm this cant be that hard .....??

[BULLBLASTER]

338 norma?

[bullfisher]

8x68s

[smdave]

9X64

[jasnt]

338 ultra

[Yondering]

338 Lapua? That doesn't look quite right somehow but maybe just the pic. 

[Matth]

Looks closer to the 300 Lapua, but the shoulder doesn't look quite right.

[JimmyHoffa]

some kind of H&H without a belt