Possum 284, the 22 Hornet is a better long range cartridge than most people give it credit for. My gun is a Ruger 77/22 that I've bedded and reworked the trigger and it is capable of shooting accurately well past 500 yrds. The gun is nicknamed the B.O.A.G and has taken Rock Chucks and P. Dogs well past 600 yrds. The write ups are on LRH from Aug. 2005 ( if they still exist )
The load I shoot is 13.9 gr L"il Gun W/ a 40 grn NBT and Win. cases @ 3080 fps. I only shoot the gun single shot with the bullet seated .020 off the lands, which only leaves me .090 of bullet in the case neck and a lot more room in the case for powder.
The B.O.A.G will shoot about 1/2" to 3/4" on average, at 100 yrds and hold sub MOA out past 600yrds.
Admittedly the bullet performance at these ranges is minimal at best, but P Dogs out to 400 or so drop in their tracks. Rock Chucks are tougher , but will drop at 350-400 if you poke it in the right spot.
The ones and I shot at 600 plus were to try to get into the VHA 500 yrd club. These longer shots were at 11,200 ft elevation which gives a big advantage. Also we picked shots at Chucks that were far away from their dens feeding to make sure they didn't get underground before dying. We were succesful at 640yrds.
It sure is fun to pull it out at the range, dial it up and whack the 600yrd Gong with a bunch of non believers around. --------7mmRHB