.25 AV Avenger

[HunterWhite]

Bill, thanks for fixing that 2703 grains vs 27.30. I was getting very envious of that 3880 FPE.


Hunter

[avator]

Bill, thanks for fixing that 2703 grains vs 27.30. I was getting very envious of that 3880 FPE.


Hunter

LOL... Keith did an incredible job on this spread sheet but for a new guy.. it's alot to take in. I've had to watch his video several times. As a matter of fact.. I put his video on the laptop and followed along on the desktop a few times.
But, if you build a spread sheet for each individual gun and keep them separate it's pretty easy in that much of the data for a gun can be static.
I also thought about making a punch list so I don't miss steps until I make it old hat.

[avator]

On top of that, I'm not a season HPA tuner so I'm learning that as I go as well. Learning the difference between simple things like ES and SD.
Then we got guys on here talking about co efficiency and all kinds of astronomical equations. Heck, I just barely know how to be co efficient with my wife.   

[avator]

Bob Sterne gives me a headache.
I saw him post a joke the other day and I was relieved to find out he was human. I almost thought he was a test model for AI technology.   

[Rick67]

Bob Sterne gives me a headache.
I saw him post a joke the other day and I was relieved to find out he was human. I almost thought he was a test model for AI technology.   

Him, Loyd, and Nervoustrigger = The Holy Trinity of this forum 😄

[avator]

Well, I reckon I'm just that "sort" of guy...   

Now if I flip that cash box tray around the other way I have the numbers for sorting .22.   

[triggertreat]

Another 1/8 turn in on the HS?

And do you like then 2200 reg set?

I would suggest adjusting the Hammer Spring (HS) by 1/8th or 1/16th out to see if the Extreme Spread (ES) becomes tighter. Currently, your ES is at 2.86%, which is quite satisfactory for 50 yards. If you were to adjust the regulator, you'd need to retune from scratch. The goal is to achieve optimal valve efficiency with the current regulator setting. If you're not satisfied with the resulting Foot-Pound Energy (FPE) at this setting, then you could adjust the regulator higher or lower for increased or decreased power, respectively, and then retune. The hope is that in doing so, you neither exceed nor fall short of the desired hammer energy for the FPE you're aiming for.

Although I'm not acquainted with your specific model, I'm assuming it operates similarly to my Marauders, which use a standard hammer and hammer spring configuration.

[avator]

Another 1/8 turn in on the HS?

And do you like then 2200 reg set?

I would suggest adjusting the Hammer Spring (HS) by 1/8th or 1/16th out to see if the Extreme Spread (ES) becomes tighter. Currently, your ES is at 2.86%, which is quite satisfactory for 50 yards. If you were to adjust the regulator, you'd need to retune from scratch. The goal is to achieve optimal valve efficiency with the current regulator setting. If you're not satisfied with the resulting Foot-Pound Energy (FPE) at this setting, then you could adjust the regulator higher or lower for increased or decreased power, respectively, and then retune. The hope is that in doing so, you neither exceed nor fall short of the desired hammer energy for the FPE you're aiming for.

Although I'm not acquainted with your specific model, I'm assuming it operates similarly to my Marauders, which use a standard hammer and hammer spring configuration.

Not really goaling for FPE, just a flatter string with enough to hit 45yd max and 35yd average.
I think the difference from the MRod would be the added adjustability of the throttle on the TP.

[avator]

I'll continue pouring pellets today. Hopefully I can get enough in the 27.30 +- .05 to run a string. I'll decrease hammer by 1/8.
After that I'll have a look and see what my shot count looks like at a 4k fill. If it's close to 4 12 rnd mags (48 shot) I'll be happy. I think that's a reachable goal.

[avator]

I appreciate all the input and help.

[splitbeing]

The odds on achieving that goal are very high.  I'd take that bet any day. Thanks for demoing the spreadsheet. It's pretty cool how it calculates efficiency along with everything else.

[avator]

It appears to be a must have tuning tool. And Keith brought to us for FREE !
And so simple even a caveman (like me) can use it. 

"Ain't this a great place to be"?

[triggertreat]

It appears to be a must have tuning tool. And Keith brought to us for FREE !
And so simple even a caveman (like me) can use it. 

"Ain't this a great place to be"?

I appreciate the kind words. I was attempting to fine-tune all of my air guns and maintain records, but there was nothing available that met my needs, so I decided to create my own spreadsheet that could do this. The greatest hurdle was my lack of knowledge about Excel. Overcoming this steep learning curve has been satisfying, and I'm glad I persevered through the challenges and was able to share with likeminded friends.

Moving on to more significant matters, it's quite remarkable that you can achieve 60 shots at 38 FPE with less than a 3% ES on 180cc. I have marauders with a 215cc capacity, and I can't manage to achieve anything close to that.

I did lookup your reservoir CC on Pyramid Air.  Maybe you can confirm this by looking at the specs for your specific model.  I'm not real sure of which model you have.

[Blowpipe Sam]

IMO that spread sheet should have its own important topic post.

[avator]

It appears to be a must have tuning tool. And Keith brought to us for FREE !
And so simple even a caveman (like me) can use it. 

"Ain't this a great place to be"?

I appreciate the kind words. I was attempting to fine-tune all of my air guns and maintain records, but there was nothing available that met my needs, so I decided to create my own spreadsheet that could do this. The greatest hurdle was my lack of knowledge about Excel. Overcoming this steep learning curve has been satisfying, and I'm glad I persevered through the challenges and was able to share with likeminded friends.

Moving on to more significant matters, it's quite remarkable that you can achieve 60 shots at 38 FPE with less than a 3% ES on 180cc. I have marauders with a 215cc capacity, and I can't manage to achieve anything close to that.

I did lookup your reservoir CC on Pyramid Air.  Maybe you can confirm this by looking at the specs for your specific model.  I'm not real sure of which model you have.

I'm seeing 210cc on a few different searches. I'll change that value and repost.

[avator]

Updated Chart....

[triggertreat]

Updated Chart....

I made an error; an accurate calculation would require subtracting the plenum cc from the total reservoir cc. Therefore, the correct inputs would be 180 cc for the reservoir and 30 cc for the regulator, amounting to a total of 210 cc. This adjustment accounts for the space occupied by the regulator within the reservoir. Apologies for the oversight; I understand the importance of having precise figures to go by.

[avator]

OK so I should change it back to 180?

[triggertreat]

OK so I should change it back to 180?

Indeed, for accuracy's sake.

Here's how I configured my regulated .25 Marauder hunting tune. The reservoir numbers are divided to sum up the total cc's of the reservoir.

[avator]

Big difference in start fill pressure.