Duck gun for turkeys

[Crawl79]

I am a fairly experienced turkey hunter and have tried many chokes and shells.
One experience that I want to mention that I saw this year.

I had a turkey gun I custom built that was stolen last year. This year I bought a new gun and with same brand choke and same shells (Winchester LB XR's) I was having allot of difficulty sighting in my gun. I use a Burris FFIII reflex sight and I would use low power shells to sight in the gun at close range before switching to my LB XR's for patterning at 40 yards. My patterns were terrible, finally I used a bigger sheet and figured out my pattern was over a foot high and left.

I then shot my XR's at 15 yards to sight in the gun and they were aprrox. 1.5" off at that range.
Once I sighted the gun in for the correct range and shell I had close to 200 at 40 yards and 70 and 80 + in turkey head and neck at same range.