Daystate Air Ranger shifting POI
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Topic: Daystate Air Ranger shifting POI (Read 685 times))
Stefan
Plinker
Posts: 263
Daystate Air Ranger shifting POI
«
on:
April 20, 2015, 05:28:08 AM »
I did sight it in on 50 meters. Its a non FAC .177 version.
My chrony wasn't around, and after sighting in and having superb shot groups at 230 bar fill, as it went down, POI started shifting... its PITA right?
Yesterday, I finally chronoed it, and at 230 bar I had around 790 fps with 8,44 gn JSB. As fill pressure went down, at 200 bar, I had a few shots over 800 fps. 808, 812, 818 if I remember good. Then it went back to around 800 fps.
I have opened her up again, and turned hammer preload a quarter turn ccw - speed dropped to 730. Turned it a 1/8 of a turn cw, I am at 750 fps. Now I am afraid to touch anything more, this speed is at 195-200 bar fill pressure. I have to pump it up to 230 to see will that affect speed.
Whats your opinion on this? What to do, what to touch? I don't have to keep it in 12 ftlbs corner, but it isn't the version that's meant for FAC, that's why I don't increase the speed.
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Daystate Air Ranger shifting POI