Charlie
In my gun the choke makes all the difference. I tested the following chokes: .660, .665, .670 and .675. All by different manufacturers. Then I tested them with different ammo. Using Hevi shot no 6 3 1/2" shell, I got 260-270 pellets in 10" at 40 yds. That was with Rhino .670 choke. My best combo is the Indian Creek .675 choke with the mega weight blend with 290-300.
Charlie, I just don't think you are going to be able to do much better with modified choke.
Just not tight enough. I don't think your gun was intended to go real long range.
Best, Ray
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