No, they don't. Your average brown rat breeding pair can produce around
2,000 new rats a year. Rats breed year round, every chance they get (kinda like humans
).
Chipmunks breed once in early spring, then once in early summer and usually produce litters of no more than six each time. The Western Chipmunk only breeds once a year. Chipmunks aren't even in the same ballpark as rats in any category.
Chipmunks are kinda territorial, too. I've had them around my house for decades and never seen more than two during any one season.
Chipmunks for target practice? I'd hide sweetgum balls in the grass to shoot at before I'd kill a harmless little animal for fun.