What caliber? As a rule, most single shots, shoot best with a rimmed case, that is they headspace on the rim, 30/30, 45/70 as an example. If i ever find a Ruger #1 in 7x57, at a even close to decent price, it will come home with me. I had a .243 that would shoot 3/4"@100yds, 3 shot group, and a 45/70 that wouldl shoot a ragged hole at 100yds with 3 different loads, and shoot close to the same impact. Bottom line, is they are a classy, classic gun, made for hunting, and should shoot around 1" with factory ammo.