Thread: Marlin 3030 accuracy issue

Afternoon all. I have an earlier Marlin 3030 lever action. ( made byMarlin, micro grove ) . When I first got it I put on a cheap 3-9 scope.
With hornady Lever evolution I could shoot 1.5 inch groups at 100. It was good enough to take for a bush type hunt.
Ive an Issue with it now that the groups are inconsistent and 5 inchs in a circle ( if u can call it a group).
Ammo is the same. I’ve tried mounts ,bases, scopes etc. The crown is good. Ive given it a deep clean with bore paste but I still cannot get it to where it used to be.
Ive read a bit about the barrel clamps etc affecting accuracy and I wondered if anyone had any suggestions.
If I could get it to 2 inches Id be rapt but at the moment its not consistent enough to take out.
Thoughts greatly appreciated.