Hi guys. I tried the search function but not finding what I need. Everyone states to set your reg pressure at this or that, how do you know where your setting it? I'm thinking I need to buy a regulator pressure tester?
Tuning How do you know where your regulator pressure is set at?
- Thread starter mikes383
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You could also shoot over a chrony from, say, 170 bar on down. Note your pressure at each shot. Where the shot curve ceases being flat but drops the gun has gone off reg.
A well tuned gun will have a few flat shots even after it has dropped off the reg but you won't be far off.
A well tuned gun will have a few flat shots even after it has dropped off the reg but you won't be far off.
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That would be the most accurate method but I would just go by first hand hands on accuracy in YOUR GUN NEVERMIND what others say.
Shoot perfect already? never F#CK WITH IT EVER AGAIN.
Shoot perfect already? never F#CK WITH IT EVER AGAIN.
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I agree, if it's not broke, don't fix it. I was just curious as I have one that dropped 50 bar in 7 shots. I thought that was excessive so I backed off the hst 1/4 turn and was able to shoot 17 dropping only 40. I do have a chronograph on the way, so I will do more testing before I adjust anything further.
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I was going to advise something along the same lines as Parrotculler. However be advised that you can get confusing results depending on how it's tuned. And by "tuned" here, I simply mean how much hammer spring tension is applied.
If it's tuned fairly well, it will behave as Parrotculler described...though the actual setpoint will be somewhat higher than where the velocity begins to taper off.
If it's tuned poorly with too little hammer strike, you'll see a rise in velocity as the pressure falls below the setpoint.
If it's tuned poorly with far too much hammer strike, you will actually get a better sense of where the regulator is set.
If it's tuned fairly well, it will behave as Parrotculler described...though the actual setpoint will be somewhat higher than where the velocity begins to taper off.
If it's tuned poorly with too little hammer strike, you'll see a rise in velocity as the pressure falls below the setpoint.
If it's tuned poorly with far too much hammer strike, you will actually get a better sense of where the regulator is set.
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I can only describe my work-around for that, as I don't have a reg tester. With the reg at its current set point, start with a low hammer spring tension, and work up as you shoot over the chrono. You will reach a point at which additional hammer spring tension yields no more velocity. If that speed (or, about 95% of it) is too high or low, you need to move the reg set point accordingly. Put it back together and repeat. That won't tell you the precise set point, but you really don't care, as you just want a balanced tune. Depending on the rifle, it can be time consuming, and you may need a few O rings for the pieces that have to be repeatedly re-installed. But, you should end up with a good result, since simply using an arbitrary reg set point is unlikely to yield the most efficient HST for a given velocity. I'm no pro, but this has worked for me.
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Its funny u said that, thats about all I do, today, while plinking, fired until my shots fell off, looked at my bottle pressure... yep below the reg pressure, fill, start over...
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define "flat" as extreme spread?? if flat is 0 from 170bar to off reg. "0" will never happen..imo, but what is happy 5-10- 20 es??? my fx 22 crown (with no wind) will shoot a 3/8 hole @ 40yds.but a 10fps increase will raise point of impact,as will a 10fps decline lower the poi. that being said, i feel extreme spread in feet per second has more effect & is more important than most other settings.but ask a dedicated bench shooter.i am just a old back porch plinker.ab
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Courtesy of Bob Sterne or Robert Lane, not sure anymore who (apols and credit to the real progenitor).
The red curve is the well tuned gun I was referring to. It went off reg at around 1500 PSI (probably a little higher than that, as explained). The other colored curves are guns that are not tuned so well, as explained by others in this thread. (HST too high or too low).
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SHHH...Don't tell that to AirNGasman...
He shoots unregulated guns at 50 and 100 yards regularly in competition for decades now and lost count of how many trophies he won.
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One might also watch Clickspring on YouTube and surmise a machinist needs little more than a set of hand files and a go get ‘em attitude.
Ron’s achievements are a bit like that.
Ron’s achievements are a bit like that.
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I once measured the point where my taipan veteran in .177 started to climb in speed. It seemed to be around 130 bar. Now that I have tuned it for higher speed (910-920), it is actually not that easy to measure, as the velocity stays quit stable all the way down to 100 bar or so. I do know the max speed should be somewhere closer to 1030-1040 fps, with the same 10 grain pellet. I am not an expert but I am guessing the reason the velocity change that litle off reg at that speed, is that the behaviour of the hammer spring seems to be a perfect balance against the pressure drop. With a different pellet weight or tune, the point might be easier to measure.
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The easiest way to measure it is probably to adjust hammer so the gun waste air (and probably shoot bad), as it will the drop velocity the moment you reach reg setting.
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