My dads old 336 .30-30 with a micro groove barrel will only shoot 3/4” groups at 50 yards with properly sized bullets of sufficient hardness. 1.25” at 100 yards. An old 1895 I had would do 1.5” at 100 with the Lyman 457122 and their 405 gr. Bullet. I don’t think you have to worry about the microgroove barrel being inaccurate if the bullets fit it.
Old70
