I have never been much for long weapons of such low power.
Why not go all the way down to a .22 long rifle and plink on the cheap.
I had an HK91 that was more my line of rifle.
There are some good .30-06 rifles I would like though.
And I gaze longingly at those Finnish Lahti 20MM L-39 Anti-Tank rifles when one is on sale.
Finding tanks to shoot at could get expensive.