I don’t think I have a Marlin that doesn’t consistently impress me with ammo it likes.....don’t actually have one in .30-30 but have 336s in 32 special, .35 Remington, and .38-55, 1893s in 32 Special and 38-55, several 1894s in .32 H&R, 25-20, .32-20, 41 magnum and .45 Colt, and 1895s in 45-70 and 40-65 all of them shoot around 1” for three shot groups at 100yds (1894s that would be 50yds) with the ammo they like if I do my part. Accuracy of these are why I have them and mostly use them for lever action silhouette (as do many other competitors) and hunting.

PennDog