I would plan on doing most of your shooting with the .22 rifles. You will use a lot of ammunition, and using an AR or a Garand at 25 meters is a waste of money. The Garand will give you experience with the recoil, but unless you know how to properly shoot first, this will be more of a hindrance than a help. Also, if you know how to properly shoot, the recoil is pretty inconsequential. As for the AR, IMHO, at 25 meters, your just making more noise and wasting more money. I would also leave the optics at home.
Thanks!
The thoughts on centerfires were just for events like Palo Alto that went out to 200 yards. One hundred is a chore for me with open sights.