Thread: Marlin 3030 accuracy issue

Originally Posted by Marty Henry

The microgroove rifled barrels evidently have a reputation for inconsistent accuracy especially with cast projectiles which is why the ballad style is preferred.
Try a copper cleaner it may be that your rifling is partly clogged due to rapid fire,

a 2 minute Google search will find plenty of examples how to use cast in micro groove barrels . . . not sure why this rumour keeps coming back but it just refuses to die.

best fix of the Marlin is remove the front barrel band and attach the mag as in this pic
Status Guns in Invercargill did this work on mine . . worst it will do is 2 inches at 100 with cast, both subsonic and 1600fps . . mostly it shoots a lot better giving a bolt gun a run for its money shooting cast.