As an example of the wrong tune, I have a gun right now (won't mention model) that shoots about 860 through about 40 shots. Then it comes off reg and gives me about 6 shots @ 890, then down. So that means the spring is way low for the reg or that the reg is way too high for the speeds I want.
Also, I found that when this gun goes off the reg and I get those few shots around 890, it is far more accurate at that speed. The problem is, this gun only gets about 40 shots set like it is. If I increase the speed to 890 to get the accuracy, I may get fewer shots. But then if it is tuned correctly, the shot count may increase. We won't know until it gets the wrenches
Crusher
Maybe that ammo likes the 890 speed, if that doesn't work because you get few shots, try a lighter ammo to see if you can get more shots.
That's what I did on my Taipan, I tried 34gr but to shoot them right I was sacrifying shot count change tune for 25gr and was able to get 50 shots and outstanding accuracy
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