Stolen from a FB group, I hope the title is self explanatory. Feel free to guess and post your own!
This has some Euro stuff, so it might be a hard nut to crack (or not). Will solve in 24 hours if nobody does until then.

5.6x35R, .222 Rem, .22-250, 5.6x50mag, .22 Sav. HP, 7x57, .303 Brit, 8mm Kurz, .348 win, 9.3x72R, 9.3x62, .45 colt

Pretty good! Surprised by the 5,6x35r. All of them are right except for the 5,6x50, which is a 5,6x57, the 9,3x62 is actually a 9,3x64 and the .45 is a .454, but that was a mean one, I admit.

I have an odd fascination with obscure, European, and historical sporting rifle cartridges. I should have guessed the 5,6x57 since it looks the same length as the 7x57, and I thought the 9.3x62 looked a little "odd" but yes, the .454 was a mean one! Thanks for the challenge. :-)
as a side story, I was just offered the chance to buy a Brno ZKK 600 in 9.3x64, that's a very nice cartridge and rifle combination but I passed up the opportunity. So many cool cartridges and rifles to try, too little time and money!

Too many that I can't name, but I am pleased to see Marty remembered in your avatar - great singer and a nice guy.