Mine was one of the first barrels made in the 1:20".444, it was tested at the factory before it was shipped to me, they shot Rem 240gr, Hornady 265gr Light Mags and the Leverevolution ammo, all three shot 1½-1¾" 100yd 3-shot groups. I've not shot any factory ammo in it, but it shoots 3 different handloads under 1" with Hornady 240gr and 265gr jacketed bullets and 355gr cast bullets.
I have five 45-70s, depending on the load, they all shoot under 1½" 100yd groups, most under 1" with handloads, haven't shot a lot of factory ammo in them tho, what I have shot is the discontinued PMC +P ammo, that was right at 2½" at 200yds. I shot the Rem 405gr ammo in a new SS Ultra Hunter a couple weeks ago, it grouped less than 2", and the Win 300gr Silver box at ~1½".

