Several months ago, I purchased a .20 caliber Beeman R9 from one of our great AGN members via the classifieds. While it was very accurate and smooth, it was only producing just over 11 fpe.
The rifle is set-up with a Vortex Diamondback Tactical 6-24xFFP scope on top of Sports Match vertically adjustable mounts utilizing the recoil stop pin, though once tuned, I have never had a scope issue from recoil with any of my spring rilfes.
Over the last few days, I took on a repower project, utilizing a Vortek PG4 Steel HO kit. As I have installed several of the Vortek kits very successfully, I have learned that they come in a little over powered for my taste. I asked Tom to trim this one by 1 coil prior to shipping, and it came in with 30 coils. I find my Weihrauchs and Air Arms springers perform very well in the 14 to 16 fpe range, thus that is always my tuning target.
After thoroughly cleaning and degreasing, I installed the new Vortek piston seal, relubricated the power components, and reinstalled. I tuned the trigger to break very clean without any drag coming off of the first stage. Then I proceeded to pellet test the six different pellets I had tested when the rifle came in originally. The results can be seen in the accompanying chart (Exhibit 3). Except for 1 pellet tested, the group sizes decreased significantly while the power increased >20% in every case.
I find that the efforts and expense required to comprehensively complete a proper tune nearly always yields significant improvements.
For those of you that own and R9 or Weihrauch 95, I thought you might like having the data to review as found below.
DZ
The rifle is set-up with a Vortex Diamondback Tactical 6-24xFFP scope on top of Sports Match vertically adjustable mounts utilizing the recoil stop pin, though once tuned, I have never had a scope issue from recoil with any of my spring rilfes.
Over the last few days, I took on a repower project, utilizing a Vortek PG4 Steel HO kit. As I have installed several of the Vortek kits very successfully, I have learned that they come in a little over powered for my taste. I asked Tom to trim this one by 1 coil prior to shipping, and it came in with 30 coils. I find my Weihrauchs and Air Arms springers perform very well in the 14 to 16 fpe range, thus that is always my tuning target.
After thoroughly cleaning and degreasing, I installed the new Vortek piston seal, relubricated the power components, and reinstalled. I tuned the trigger to break very clean without any drag coming off of the first stage. Then I proceeded to pellet test the six different pellets I had tested when the rifle came in originally. The results can be seen in the accompanying chart (Exhibit 3). Except for 1 pellet tested, the group sizes decreased significantly while the power increased >20% in every case.
I find that the efforts and expense required to comprehensively complete a proper tune nearly always yields significant improvements.
For those of you that own and R9 or Weihrauch 95, I thought you might like having the data to review as found below.
DZ
