Tuning del
- Thread starter shoot44
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Try filling to only 200BAR or lower maximum instead of 250BAR you might get better consistency.
Won't matter is it's accurate anyway a 30-40fps spread won't affect hardly anything at 50 yards.
Won't matter is it's accurate anyway a 30-40fps spread won't affect hardly anything at 50 yards.
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At shot #24, what BAR did you end up at? What BAR is the Huma reg set at? What pressure are you filling to? Maybe a BAR graph also needs to be incorporated into your string. Are you shooting straight from the tin or did you weigh and sort your pellets? There's a lot of variables to consider.
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The downward trend, to the extent there is one, is probably due to the input regulation characteristics. That is, the output pressure is slightly higher when the reservior is at high pressure. That's just an educated guess. I couldn't find a good picture of the regulator internals...if it has a large orifice, that would be a clue.
Whatever it is, it can be thought of as an academic curiosity more so than a problem. You have a 1.5% ES for the entire string of 35 shots before it tails off. To have adjusted nothing and using unsorted pellets, that is an exceedingly good result. It is so good in fact that when you decide to do those things, it will be hard to improve upon it.
Whatever it is, it can be thought of as an academic curiosity more so than a problem. You have a 1.5% ES for the entire string of 35 shots before it tails off. To have adjusted nothing and using unsorted pellets, that is an exceedingly good result. It is so good in fact that when you decide to do those things, it will be hard to improve upon it.
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are you hand pumping ? If so remove fill adaptor { after a full safe total discharge } and let it dry out good. a tiny bit of water in wrong place can do weird things.
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No reg fitted to an airgun is capable of giving the same regulated pressure regardless of fill pressure, as fill pressure drops, so to does the reg pressure, only slightly but it does.
Also the speed at which the bottle “tops up” the reg also changes wilth stored pressure.
if your gun is running close or at the maximum the reg pressure will allow then each shot will get less pressure and less top up so velocity will drop.
Knock your maximum velocity down to where your minimum currently is and the downwards power slope will not be as much.
Bb
Also the speed at which the bottle “tops up” the reg also changes wilth stored pressure.
if your gun is running close or at the maximum the reg pressure will allow then each shot will get less pressure and less top up so velocity will drop.
Knock your maximum velocity down to where your minimum currently is and the downwards power slope will not be as much.
Bb
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Let me answer with a post by Bob Sterne: https://airgunguild.com/ask-bob/tuning-a-regulated-pcp/
TL; DR
You might be tuned at the plateau, considering lowering the tension of the hammer spring until the gun is shooting at around 970fps given the numbers you gave us originally, and see if the slope improve:
The relevant part on the blog is this one:
TL; DR
You might be tuned at the plateau, considering lowering the tension of the hammer spring until the gun is shooting at around 970fps given the numbers you gave us originally, and see if the slope improve:
The relevant part on the blog is this one:
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Give it a try, if it doesn't work you can always revert and put it where you like it! I think what's really important is that you have a setting where the gun is accurate and predictable, a nice flat curve is awesome but if you are getting accuracy I think that's what matter. For me I like accuracy and efficiency over power, because my style of hunting, I need to hit them in a specific point and I need a lot of shots so I don't have to go back and forth to the car filling the gun, I walk a lot on that canal.
Give it a try and I think that's the only way to learn for sure. The post from Bob is really well written, once you start reading you can't stop!
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