I got to do some testing today, and the results were, how can I say? VERY good.
Before the caliber change from .22 to .177, this gun was giving me between 60 and 65 shots off of two carts before velocity dropped noticably. After the re-build, which included a factory 15mm .177 barrel, an Archer side-lever breech and bolt, and the Archer/Steve-NC HDD, I got a measured 80 shots off of two carts before velocity dropped.
I have no idea what the prevoius owner did to the hammer spring or valve, if anything, but I have gone from a .22 gun that got 60 good shots, to a .177 gun that gets 80 good shots, all off two standard carts. I am quite pleased.
I have no chrony data, since I don't own one, but I am really liking the way this project is turning out. For the last 20 or so shots, I got tired of shooting off-hand, and used a rest. They ALL went into the same hole! It was only when the hole got a teeny bit bigger at the bottom that I realized my velocity was dropping.
I am convinced that the QB HDD is a worthwile upgrade.
I think we're all Bozos on this bus.
This message has been edited by 144man on Jun 30, 2012 6:04 PM
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