I am tuning my new 22 Avenger. I am trying to tune for shot count. I am pressurizing the gun to 300 bar. I have the regulator set at 1100/1200. I have had the hammer tension set from zero turns to two turns. I am shooting Crosman CPHP, 14.3 pellets. I have seen an ES of 20 or so for these kinds of shot counts. What do I need to do to improve mine? Can I improve mine?
Tuning How do I Minimize ES (extreme spread) when tuning an Avenger?
- Thread starter tipton1947
- Start date
One way to do it with any rifle is to head size your pellets, and then only shoot one size! Difference in how tight a pellet fits a barrel will change the speed by a few FPS. If they are all the same it will help. Good luck!! J,L,
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There are a number of general things that apply but it’s so varied that it may put you on a wild goose chase.
Instead, post a full string (or all of them) because they often contain clues as to what is wrong.
Instead, post a full string (or all of them) because they often contain clues as to what is wrong.
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The steady decline in velocity indicates the regulator has a somewhat poor input regulation.
It also suggests you have too much hammer spring tension. How far do you have to back off it before the velocity begins to fall?
What you want to do is find the maximum velocity and then back off of the HST until the velocity falls to about 95 - 97% of that maximum. In doing so, that will minimize the influence of the declining output pressure.
It also suggests you have too much hammer spring tension. How far do you have to back off it before the velocity begins to fall?
What you want to do is find the maximum velocity and then back off of the HST until the velocity falls to about 95 - 97% of that maximum. In doing so, that will minimize the influence of the declining output pressure.
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Oh, and hopefully someone can confirm the regulator operates properly at that low of a setpoint. If memory serves, the examples I’ve seen were all set higher.
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I would suggest try several other pellet manufacturers. Your Avenger probably doesn't like the crosmans. If you Avenger has the same problem with several types of pellets, then you could start looking at the gun for problems.
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I can’t find “official” documentation that says that low end of the regulator is 1100 psi. But it is in the green zone on the dial and Hardair magazine did two of their tunes at 1100 psi.
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His reg seems to be responding to his tank pressure at all HS settings. It’s like his gun kinda has a reg. I wonder if the reg will respond better at a higher set point due to its design. Or lack there of. The 300b fill might not be doing a cheap reg any favors either.
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I will try 1400 psi when the weather is better.
300 bar is the factory specified fill pressure. I having seen a number of tunes which start with that pressure.
300 bar is the factory specified fill pressure. I having seen a number of tunes which start with that pressure.
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I have my avenger .22 tuned to 1400 psi HS 1.25 turns in shooting crosman HP 14.3 and domes 14.3 at 898 FPS, JSB 15.89 864 FPS avg. I get 48 good shots from 3000 psi hand pumping.
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That’s what I am going to try next. Do yo know your “extreme spread”?
Your 3000 psi was going to be my SCUBA tank fill. But I just a Nomad II.
Your 3000 psi was going to be my SCUBA tank fill. But I just a Nomad II.
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I believe you’re going to have to try 1500 and possibly 1600 on the reg with the HS set at one turn. I think that gun might come with a big spring for the guys who want a high reg setting to push heavy stuff fast. I still agree with Nervoustrig, your showing symptoms of too much hammer strike or a junky reg. In this power hungry world, I’m leaning towards hammer strike. Turn that reg up and see.
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See how the average velocity for all 3 strings is roughly the same, despite the varying amounts (turns) of hammer spring tension? That is the big tell.
If you can’t reduce the hammer spring tension enough to see the velocity drop off, you will have to address that somehow. Either by clipping coils, using a weaker spring, or by increasing the regulator’s setpoint high enough that it comes into proportion with how hard the valve stem is getting smacked.
If you can’t reduce the hammer spring tension enough to see the velocity drop off, you will have to address that somehow. Either by clipping coils, using a weaker spring, or by increasing the regulator’s setpoint high enough that it comes into proportion with how hard the valve stem is getting smacked.
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Bump up the Reg pressure, I'd go 1600-1800
and remember, it's a $300 Avenger not a $2500 FX, Good enough is all you're going to get.
and remember, it's a $300 Avenger not a $2500 FX, Good enough is all you're going to get.
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Yeah, if you finally get a nice string at a higher reg setting and the pellet of choice is going too fast, then it’s time to figure out another spring option. At least you will know your gun is capable. Fixing or finding a spring that works better at lower reg settings shouldn’t be an impossible hurdle.
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