uncle paulie nailed it!And he needs to acquire one of the harmonics altering barrel brakes once made by Vortek. (they may still do so)I got one on an R-1 I bought from a friend many years ago. It uses a weight which screws in or out on very fine threads to alter the barrel harmonics. The effect such minimal movement has boggles the mind!It is possible to 'walk' the POI all around the target with tiny adjustments.Using it extensively constitutes a virtual graduate degree program on the effect of harmonics on springer accuracy! Tom
The biggest problem I have with all of this is that we're on the low end of the scale and anyway you look at it, it's likely going to vary from barrel to barrel just as most everything we do to these things because the kind of precision we desire is just not built into the products at these price-points. I think the situation is better once you get in the $ 1000+ price range, but those aren't perfect either.