Obviously there is an infinite number of possible tunes, but im just curious as to some tunes you guys use for specific situations and why.. Velocity, Pellet weight/shape, scope magnification, fill pressure etc.
N/A What PCP tunes for specific situations?
- Thread starter LancasterAirgunner24
- Start date
I stick with factory tune and JSB diabolo pellets, 18.13 grain (.22), 33.95 grain (.25) and 44.75 grain (.30) for target/pesting/hunting with consistent dime-size circle accuracy @ 50 yards. Target work @ 24X power on scope, dialing back to 8-10X for pesting/hunting. Fill airgun reservoir to one click over max so cool-down brings pressure to full. WM
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temp of the air cylinder.. didnt even think of that! is that strictly for your desired fill pressure or does that also have any other effects on the gun?
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I'm like WorriedMan. My guns were designed around certain pellets & tuned for ACCURACY in any situation. 2 of my 3 guns have a power dial but I've never even used it! They do exactly what I want every time I want. I've learned to not mess with perfection.
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I've never considered pressure in reservoir a "tuning" component, my only concern being reservoir pressure remaining above regulator pressure setting. Compressing air generates heat and have heard that cooler existing, and warmer entering air, remain stratified. For this reason I prefer to let freshly filled airgun sit overnight, cooling to room temps, before use. WM
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As only owning regulated airguns, I can't speak to whether or not owners of unregulated airguns utilize reservoir air pressures for performance purposes. I've not heard of the practice but unregulated airguns are not in my area of interest. WM
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Zelos specific tune. Set reg to 2,700 use 28 grain HP slugs for .22 cal.
I don't have a chrony yet , but man it shoots them slugs like laser beam.
Had to move to .5L bottle though.
I don't have a chrony yet , but man it shoots them slugs like laser beam.
Had to move to .5L bottle though.
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Two of my three PCP airguns are unregulated. When tuning, there is a pressure range you want to be in where your unregulated gun behaves more like a regulated one. You have to balance the hammer strike over a range of reservoir pressure to get the largest number of shots within a desired ES. So it's kind of a requirement for a balanced tune.
For instance, my .177 Mrod has a 30 shot string from 2800 PSI to 2100 PSI, with JSB Monsters ~880 FPS with an ES <4% (less than ~35 FPS) over that entire pressure range. If I were to fill to 3000 PSI, I might get a few more shots, but the first 10 or so would slow enough to bring the spread out to around 10%, which is no bueno for me. Or going the other way, I happen to know I have about 12 shots from 2600 PSI 2300 PSI that typically have an ES <2%.
Some folks might prefer a "Korean Cliff" type of tune for hunting, where you need only 1 to 4 high powered shots and you're looking for stopping power. This is more easily achieved with a non-regulated PCP if you're willing to place shot count on the altar of big power. Quackenbush always springs to mind in terms of this.
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I have 5fpe carbines for close pests where I need to be careful about the travel of the pellet incase of a situation out of my control. I have guns that produce several hundred FPE for big game. Tuned precision pellet only guns for competition built around the specific rules for that style. Plinking guns set up for tons of shots a fill. So many reasons for so many different times. Also used to justify getting a new toy.
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