Wayne,
Could it be some sort of scope/parallax issue? Try that with the same scope on a fixed barrel?
Could it be some sort of scope/parallax issue? Try that with the same scope on a fixed barrel?
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Maybe ??? But I don't think so ! Even on a fixed barrel, if the the scope rail isn't welded completely in line with the bore the same issue will occur. I would imagine that fixed barrel rifles with precision cut dovetail grooves in the receiver probably would not have the issue. All depends on the machining tolerances. Both the Sig and the RWS 34 have separate scope rails that are welded or screwed into the receiver. If those scope rails are not properly fixed to the receiver, and perfect with the bore, you will have the problems I encountered.
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That's what I just stipulated to. A breakbarrel airgun doesn't have the scope over the bore. I guess scope rings/bases could also be part (or all) of the problem. The scope rail might be true (in line) with the bore but scope mount bases might also throw the alignment off. Possible !
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I don't think the issue was a parallax one though. I was setting my objective focus to the range I was shooting. I shouldn't be getting those excessive POI changes between ten and thirty four yards.
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Sort of ! I had a Winchester M70 in .257 Robert's that I had drilled and tapped for a scope. The rear sight screw holes were used to mount the front scope base. The rear scope base was drilled and tapped in a poor manor. You could easily see that it wasn't centered when you removed the mount base but was very subtle and unnoticeable when the scope was mounted. Needless to say when I sighted it in at 100 yards dead on I was shooting to the left about 10 inches at 200 yards. The scopes line of sight wasn't true with the bore.
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