Yep, forgot about dueling trees, dueling trees can be a lot of fun.
My cf tree, I bought the paddles/tubes on ebay and the rest of the steel locally.
I have both a 22 and center fire tree and I had a membership to a range that ran weekly dueling tree matches.
With my trees, I can change the rules to accommodate shooters with varying abilities when shooting man-on-man (sorry! person-on-person).
Like spotting the "always-looses" shooter a shot or even a target to even it up.
And the looser always resets the tree with his ammo.
Limiting auto shooters to 6 rounds equalizes reloads with revolver shooters, and yes, there can be multiple reloads...
Shooting man-on-man is way different than using a clock/timer.
I suggest the OP to ask about dueling tree or falling plate matches at clubs local to him or build his own tree to challenge his rifle shooting buddies.
Here's a few vids:
(4) dueling tree competition - YouTube