I’ve owned rifles chambered for the following cartridges:
.17 Mach 2
.17 HMR
.17 WSM
.17 Hornady Hornet
.17 Fireball
.17 Remington
.204 Ruger
.22 Long Rifle
.22 Win. Magnum
.22 Hornet
.22 K-Hornet
.221 Fireball
.222 Remington
.223 Remington
.223 Remington Ackley Improved
.22 Savage High Power
.22-250
.220 Swift
.223 WSSM
.22/6mm Remington
6mm PPC
6mm Lee Navy
6XC
.243 Winchester
6mm Remington
.240 Weatherby
.25-20 WCF
.25-35 WCF
.250-3000 Savage
.257 Roberts
.257 Roberts Ackley Improved
.25-06
.257 Weatherby Magnum
6.5x54 Mannlicher-Schoenauer
6.4x54 Mauser
6.5 Creedmoor
.260 Remington
6.5x57R
6.5x55
6.5-06
.264 Winchester Magnum
26 Nosler
.270 Winchester
.270 WSM
.270 Weatherby
7mm-08
7x57
.280 Remington
.280 Remington Ackley Improved
7mm Rem. SAUM
7mm Rem. Magnum
7mm Wby. Magnum
7mm STW
.300 Blackout
.30-30 WCF
.303 Savage
.300 Savage
.308 Winchester
.30-40 Krag
7.5x55 Swiss
7.62 Russian
.30-06
.300 WSM
.300 Win. Magnum
.300 Wby. Magnum
.32-20 WCF
.303 British
7.7 Arisaka
.32 Win. Special
8x57 Mauser
8mm-06
.33 WCF
.338 Federal
.338-06
.338 Win. Magnum
.340 Wby. Magnum
.348 WCF
.35 Remington
.358 Winchester
.35 Whelen
.35 Whelen Ackley Improved
.350 Rem. Magnum
.358 Norma Magnum
.358 STA
9.3x72R
9.3x57
9.3 Barsness-Sisk
9.3x57 Mauser
9.3x62 Mauser
.375 H&H
.375 Ruger
.38-55
.40-82 WCF
.405 WCF
.400/.450 Nitro-Express 3”
.416 Rem. Magnum
.416 Rigby
.45-70 Springfield
.458 Winchester Magnum

Have also been able to fire, often extensively, dozens of rifles chambered in various other cartridges from the .14 Hornet to the .600 Nitro Express. They’ve usually satisfied my curiosity as far as those rounds go, but there’s always some cartridge, somewhere that just might be worth trying!

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck