resulted in such poor performance that I was truly thankful to get back to the tune that I started out with- JSB 18.1 at 800 fps.Back to shooting at (and hitting) pellet holes at 35 yards. I am pleased with the accuracy but I fear that at some point the POI will again move to the right...It hasn't been the kind of constant switching back and forth that tends to make accuracy poor as five even ten shot groups are typically covered by an advil. I have only shot about 20 shots after returning to original tune but so far no POI change. During the tune process velocities around 900fps produced poor accuracy even when shot strings had very low SD. Apparently this gun likes the JSB 18.1 at the 800fps level. I am beginning to wonder if the scope, a Swift 6-18x50AO which has been reliable in the past might have a little problem.
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