I purchased a Diana Outlaw from another CAF member last week. The intention was to use it for HFT. So my performance target was set for 80+ shots per 200 bar fill, 18 fpe.
Lucky for me, fellow CAF member Go4Robby posted his recent tune of the Outlaw. So I was able to tune my gun very quickly having set the right performance targets to shoot for.
The rifle arrived shooting over 20 fpe as the previous owner was a hunter. I immediatly took it apart and did the following:
1. Readjusted the regulator with a reg pressure gauge mounted. It was set at 110 bar.
2.Adjusted the hammer spring tension so the max speed can be achieved. It was 968 fps with 8.64gr H&N FTT
3.Loosen the hammer spring so that it shoots at 95% of max speed, now detuned to 930 fps.
4.Replace trigger blade return spring with a lighter spring and readjusted the trigger for a light and precise release.
5.Tried different pellets, especially heavy JSB's. (Hades, Beast)
Until I can try other pellets, I think I have it set as close to perfect as possible for now.
It is now shooting 16.2gr JSB Beast at average of 688 fps for 17 fpe. POI stayed consistent from 200 bar down to 95 bar. With pellet speeds between high at 695 fps and last shot at 675 fps.
Here is a compltet shot string below, from top left to bottom right, 5 shots per target. Total of 110 shots. 17 yards benched, shot with single shot tray.
Big thanks to Glenn B, Wes B, Tony L who gave me useful information on this gun. This gun performed much better than my expectations.
How’s that standard deviation with the stock regulator? Also I’ve noticed that since tuning her down, she’s a lot less pellet picky, still prefers heavier pellets but groups well with lighter ones as well
