Mike, yes, you should see better than 3/8 - 1/2 inch groups at 30 yards, assuming good conditions and good shooting technique. You mention that you expect one-hole groups only slightly larger than a single pellet hole, well, that probably crosses into a marginally unrealistic expectation, depending on what you mean by "slightly larger". When all is good, my rifles will certainly produce such groups, but not as an average. And frankly, after messing with these things 20 years, I would doubt anyone's assertion that such performance is average. One consistency I have found, flyers will occur, not a flyer off the paper, but one that stretches the group, maybe outside the group. That is just a reality of the technology. Your Daystate Wolverine hammer spring is not adjustable without some tinkering, but it shouldn't need it. I suppose that 910 fps is a bit hot with the 10.3, I would choose 880-900 in an adjustable rifle, but still, it should produce better accuracy.
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