RE: harrington and richardson rifle?
some of the calibers in the H&R/NEF are notoriously average and some are absolutely fantastically accurate.
I have 9 different calibers and the .223 is superb along with the 45-70, .22 Hornet, .22 Mag, and the .50 caliber muzzleloader.
There's another webpage devoted to the rifle and it's followers: Graybeards