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Air Gun Forums » Air gun Alley » Crosman, Benjamin, Sheridan » Air Force Condor .25

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Old 01-22-2017, 10:57 PM   #1
Clifford
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Join Date: Oct 2012
Posts: 86
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Now that the needed initial accessories were on the gun I started shooting over the prochrono to see what kind of adjustments would be needed. I thought the 33.95gr JSB king heavies would help tame the condor, and I was wrong. Out of the box on the lowest power wheel setting it was sending the heavies at 980fps. My hopes before I bought the gun was to achieve 62fpe for 20 shots with an ES of 20fps. Out of the box I had enough power but not much else.

I started adjusting the factory top hat while leaving the power wheel setting at 3 for each. I picked PW 3 because I knew I wanted to stay on the lower end to help avoid wasting air but wanted a little preload to help open the valve at higher pressures. Other folks seem to have had good luck with TH settings between 0.07" & 0.08" so set mine to 0.074" and off to the prochrono I went.

0.074"TH PW 3:
925
919
929
964
964
978
987
989
988
989
986
987
983
783? (could have been improperly seated breech)
973
974
966
963
953
950

Still too hot and not nearly flat enough so I tried to reduce the TH even more

0.068"TH PW 3
910
704
948
943
381
958
967
974
981
414
980
984
985
982
973
968
970
969
960
959
954
955
940

The random low speeds in the string indicate a breech seal failure based on the TH being adjusted too low. At this point I had to do some research on what parts might be needed since I was adjusted below the minimum for sealing but still shooting too hot. The problem is with the high flow valve and larger TH the valve opens too far. Reducing the TH alone wasn't good enough to correct the problem for me. But I got this gun because I like to tinker so I kept on tinkering.
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