Wolverine .177 shooting a little too fast
Just got my new .177 Daystate Wolverine R and have to reduce speed about ten feet per second to stay under 20 ftlbs. Assume the stock comes off then externally adjustable or remove Huma regulator and tweak washer preload?
If you Google wolverine hammer adjustment, you'll see a link to another forum- here's a short summary? I would believe the hammer adjustment is the simplest way to make a small adjustment, like you described.
There is an endcap right below the safety mechanism. Place the rifle on safe and insert Allen key in small hole in endcap through the debounce spring into the rear of the hammer pin. You can then rotate the pin to expose the grub screw. After loosening the grub screw you can rotate the Allen key and lengthen or shorten the hammer throw.
Remember the gun in new configuration has a curve. Max velocity is achieved half way through the string
Hey, Manic, I'll give that a try. I ran 5 through a chrono using 13.4 grain JSBs and the speeds were:832,831,831,830 and 831. That is a good spread. The 10.3s were not as good, 918,912,919,918,923. not as tight a spread , but historically , 10.3s have a larger weight spread and head size spread than the 13.4s and lots of folks shoot therefore shoot the 13.4s right out of the tin for FT.
tried to adjust the hammer spring as stated above. The Wolverine R does not have a shaft that can addressed with a flat blade screw driver or hex key thru the safety . I tried, no slot or hex slot in the hammer area for the screwdriver. Will have to adjust the regulator down from the present setting of 145 bar, way too high for .177 pellets should be below 125 bar. My .177 RAWs come off the regulator at about 110 bar. To remove the regulator, the air pressure must be relieved to zero. Youtube has a video where the guy loosens the air gage, I turned mine 2.5 turns and could see the Dowdy seal but no air leakage, so I retightened with great difficulty and now the gage doesn't work, bummer. So, I loosened the fill nipple and drained the air. Now to remove the regulator. Helps to remove the cover so you have more room for a wrench.
I rotated to adjustment nut on the regulator 45 degrees CW to reduce the pressure , installed back in the gun and checked the velocity.
Speeds were: 908,891,908,908,899 Still too fast and reg pressure was about 140 bar.
Took it apart and then turn adjustment 90 more degrees. Speeds were: 899.899, 846,846,841 The 899s were to reset reg, new position. 846 is too slow
Then took it apart and turned it 45 degrees CCW to up the speeds. This now 90 degrees from the start.
Speeds after some reset shots were: 865, 890, 890,890,890. The 865 is just more reset and the 890's were dups and real numbers on the chronograph. Pressure at the regulator is now 125 bar from the 145 at the start.
I also had the same problem with my R shooting the heavies at 940fps.Thanks to your post i was able to adjust it down and now it is shooting the heavies at 885fps very consistant.