Wing;
I've told this a coupla time, but here goes again.
My first Burris was the 6 X 18 Fullfield that I put on the .220 Swift. It's good enough, but I now realize that there are better scopes for the job. My main gripe with this scope & all Burris's is the criticality of the placement of the eye in the optical axis from the ocular lens. Exit pupil is not the whole story here. I know how to figure exit pupil & can compare several scopes.
Due to health issues, one of the muscles that moves my left, dominant, eyeball, no longer works. Therefore the eye is not able to make the tiny auto-corrections necessary to keep the eye centered on the optical axis. Comparing Burris to Weaver, Leupold, Simmons, makes the difference very noticable to me. The result of is this: The Burris's will lose image with extremely small movements of the eye, going to milky then black with no warning. This is with good cheek weld. The aforementioned scopes are not nearly as prone to this problem as the Burris's.
With the Fullfield, it's not a major issue. Because it's on a long-range varmint rifle, you have plenty of time to get set for a shot & make adjustments as needed.
The other scope was a Burris 3 X 9 compact with A/O that I mounted on my Ruger 77/22. I initially planned to use it for .22 competition in Wyoming. When I moved to Montana, the 77/22 became more of a gopher gun. The fast action of gopher shooting really pointed up the inability of the Burris to allow rapid eye placement on the optical axis. Also, in comparison with Weaver & Simmons, the A/O adjustment was stiffer than hell. I sent the scope back to Burris asking them to correct the very stiff A/O & examine the issue of the black-out &/or milky non-view through the scope. I got the scope back very quickly with a note saying everything was within specs. I very quickly gave the P.O.S. away & replaced it with a Simmons. I paid half as much & got twice the scope.
Both the Simmons & Weaver's I've had & Leupold's I've used with A/O, allow smooth & easy adjustment of the A/O bell with either thumb & forefinger or just the thumb. It can be done with the rifle to the shoulder & maintaining view through the scope. No flippin' way with brand B.
And there you have it, the sad but true tale of a very dissatisfied user. I'm not saying I would not try another Burris, but only with the previous conditions met.
900F