I've been making a point of looking at what ammo is available; some calibers I've noticed are:
- 30-06
- 300 Win Mag
- 7mm-08 Remington
I'm sure there are others, but those stuck out at me as having a wider variety of choice than most. Normally I stick to military types for availability of ammo - looks like I need to expand the herd a bit to include a few more rifles.