Thanks for all the input, guys.
As I kinda suspected, no firm consensus, but definitely a leaning towards the .22 cal, which I didn't expect.
To clarify for the above poster, there is no "disrespect" for other shooters (with .22's). To be perfectly candid, and please- no one take offense- shooting rimfires just doesn't capture the excitement of the hobby for us.
While I'm not a rich man (especially in this economy the last few years!), we do reload which keeps our costs down. And, ammo cost is not our primary consideration. If all we were concerned about was putting a projectile into the center of a bullseye- we'd be shooting air rifles. Again, being honest, all three of us (my 13 year old started 4 mos. ago with an AK
, and damned if he can't shoot consistent 3" groups with it now) like the "power" of centerfire weapons. Can't explain it, or justify it, it's just the way it is. Last weekend at the range there must've been a .50 cal being shot across the berm at the 200. Couldn't see it, but every time it went "BOOM" we just looked at each other, smiled, and shook our heads (and thought...$5, $10, $15, $20...
)
Some of you, I suspect, will "get" what I'm trying to say...
I believe CWKahrFan hit the nail on the head for me. 9mm it is.