My brother in law came down to hunt pigs and brought his Marlin 44mag. We went to check the zero on the scope and it was all over the place. We checked the bases and rings, they we're tight. So we thought it must be a bad scope. We put on an old Simmons that came off my .308, but still the same. We went to town and bought a new one and now it started to group, but was giving 5" groups at 75yds.
His load is a Berry's 240 with 13.5 gns of Bluedot, I think.
We also tried some factory ammo with a bullet that looked the same, then some Remember 240 jsp. But they were all the same. We cleaned it, but no change. He says it shoots great with 180jhps.
Any ideas on what to check next?