This gun can use up to an 1800 psi fill, and with the hammer spring preload set 2 turns out from maximum, that is what you get. The first thing you need to know is that there is more than one “right answer” when tuning unregulated PCPs! Oh, great! Another decision to make!Ĭonsider the chart below, noting that for each shot string there is a corresponding colored line showing the pressure drop:įirst, look at the black string on the upper left. Now you will want to know how to optimize your gun within that. Once you have chosen a pellet that meets your needs, the basic parameters of the gun are set. The point is that you can’t keep increasing pellet weight forever in the quest for more power, without other (often drastic) modifications to the gun.
In that particular gun, once the pellet weight exceeded 80 gr. However, if you go too far, the gun simply cannot keep up with the demands, and the FPE will eventually fall, like this: Generally in PCPs, a heavier pellet, while reducing the velocity, will actually increase the FPE. More preload or a smaller gap increases the hammer strike, and vice versa.īefore we get into the details of tuning unregulated PCPs, let me deal with one other thing…. Generally, this is done by changing the hammer spring preload, or by adjusting the gap between the spring and hammer to change the “free flight” and cocking distance, if you are using an SSS or SSG. So, now you have a given setup, capable of a given performance, and you want to optimize that performance by “tuning”.įor this article on tuning unregulated PCPs, we will assume that the fine tuning will be done by varying the hammer strike.
For the most part, the manufacturer sets those parameters, or you may have chosen to modify them to meet your needs. In previous articles in this series I talked about how air pressure, barrel length, hammer strike and port size affect the power output of a PCP airgun. Today, HAM’s Technical Editor, Bob Sterne gives the benefit of his experience in tuning unregulated PCPs.
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