.17 Reminton. You'll have a bit of a search to find the rifles and Ammo (components) though.
The original factory Remington rounds had soft jackets that fouled the barrel of my 700BDL severely with five rounds. It's like someone painted the bore with copper!
Handloading with Hornady or Berger bullets effectively reduces that considerably. I once shot 80rds in a Gopher patch in one day with the Hornady 25gr HP being pushed to 4050fps with IMR 4320 and didn't have one quarter of the fouling of the factory rounds. Mind you, every 5 shots you needed a cooling period, but bullet quality is also key...
The big advantage of the .17 Rem Cartridge is that it is very flat shooting to 300m. If you zero at 250m the bullet never rises more than 1.6" from the muzzle out to 250m, and drops only 2.2" at 300m.
Very deadly on Coyotes, with little to no pelt damage if that's your thing...