RE: Marlin 1894 .44 mag ammo
6 inches at 75 yds means something is wrong with your gun. Check the linkage/barrel band between the magazine tube and the barrel, clean the gun and tighten up the connections. If it continues to shoot that bad then send it back to marlin. Something else to consider is what type of sights your using and what kind of groups you get with those sights in other types of guns. Don't mean to discredit your shooting but I have owned alot of marlins in all calibers(at least 2 94's in 44mag) and none have ever shot that bad. I get better groups from a unrifled slug in a shotgun barrel. Take care.