The 7mm Mauser is really common. You'll find ammo basically anywhere, including walmart. I've used the old mauser for deer and hogs in the past, it does quite well.

48th has it right, although I'll not be quite as vulgar. Typical factory loads are kept at lower pressures than modern models are capable of in deference to the older mausers, I want to say Turkish 38's or 98's, but that doesn't seem right. At any rate, handloading can push the 7mm mauser a bit farther than factory loads, but you really won't be hurting to simply use factory loads anyway. It's a great round, it's killed a lot of game over it's lifetime.