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January 15, 2023
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I have a Monson 715-8VH that I changed the cylinder on because the original cylinder pin gauged at .361, was giving me blowback, and I didnt want to have to use oversized cast bullets all the time. Orphan cylinder gauged at .358 on 5 and .359 on 1, and I had it fit by the CZ shop in New York. Shipping cost as much as the work. Now the gun shoots fine, blowback is no longer a problem, and it groups .358 cast bullets at 2 1/2 inches at 25 yards using 14 gr of 2400 with iron sights, which is pretty much my best ability with my aging eyes. My question is this: I cannot get the point of impact any closer than 3" to the left side of the point of aim (bullseye) even with the rear sight blade moved all the way to the right. I never really sighted it in for record before I sent it off the get the new cylinder fit, so I cant compare before and after. I dont think it would be a cylinder problem, and besides, I redid the gap to .002 and get daylight all the way around on each chamber. That leaves the barrel. Is it possible the barrel is slightly bent? Would the shroud have any effect? The muzzle appears normal and the barrel and shroud went together normally. First, I should probably roll the disassembled barrel on a flat surface to check for runout. Then reset the gap to .004 then .006 and see if the point of impact changes because of the barrel rotation. Anybody have any contrary ideas on what may resolve this issue? (I know, just shoot to the right...) What would a gunsmith do if it were a fixed barrel/fixed sight gun? Whack the barrel with a lead hammer? Any help appreciated.
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Dans Club
March 25, 2013
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Use a dremel or file? and remove a smidgen of the right side of the rear sight box. That will widen the box of the rear sight and enable you to move your point of aim to the right.
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