Bore Shot- What Do You See?

[Solo1]

Ok thanks. If you remember, you asked me to turn the reg way down and work up in 5 bar increments. When I did that my best pellet groups were at approximately 158 bar and they were at 75yds. I’ve attached that group. I’m going to just tune it for pellets and if it shoots slugs it’ll be a bonus. The driving force is the swaging press sitting there with enough lead for 10,000 plus slugs lol.

Oh i understand you would like it to do both and i hope you find a tune to get it to shoot like it did in the beginning im just offering advice what i think i would do seeing your results.

 

[Solo1]

If it turns out it likes the very high reg pressure it might be good to get a reg you know works at that pressure and compare to yours then you would know and know you had a reg to handle it

 

[Billm]

If it turns out it likes the very high reg pressure it might be good to get a reg you know works at that pressure and compare to yours then you would know and know you had a reg to handle it

I’m guessing that if I turn it back down, I’ll find that sweet spot again. It was shipped at 180 bar originally and it improved when I took it down to a lower pressure. I didn’t get groups like I did yesterday until I tuned the hammer to max velocity and backed it off by about 4%. But, not really any better than at 158 bar. The hammer spring has a very short range of adjustment, where it actually changes anything. It maxes out relatively early, or so it seems. I’m wondering if the hammer/spring combo is kind of mismatched for the AOA power tune. I only went to 180 bar to try and push the slugs a little faster to see if that would help. Most commercial slugs in .30 appear to be in 50-65gr, with a couple at 45gr. The Sonoran struggles to launch a 52gr slug beyond 830-850 fps at max power. I’ve managed to get some 45-47gr up to around 875fps. I’m not opposed to taking and trying advice. I’d rather be at a lower pressure if it improves accuracy and gives a few more shots. It was shooting better slug groups at the lower pressure before. I learn a little but more every time I try something.

 

[Solo1]

I’m guessing that if I turn it back down, I’ll find that sweet spot again. It was shipped at 180 bar originally and it improved when I took it down to a lower pressure. I didn’t get groups like I did yesterday until I tuned the hammer to max velocity and backed it off by about 4%. But, not really any better than at 158 bar. The hammer spring has a very short range of adjustment, where it actually changes anything. It maxes out relatively early, or so it seems. I’m wondering if the hammer/spring combo is kind of mismatched for the AOA power tune. I only went to 180 bar to try and push the slugs a little faster to see if that would help. Most commercial slugs in .30 appear to be in 50-65gr, with a couple at 45gr. The Sonoran struggles to launch a 52gr slug beyond 830-850 fps at max power. I’ve managed to get some 45-47gr up to around 875fps. I’m not opposed to taking and trying advice. I’d rather be at a lower pressure if it improves accuracy and gives a few more shots. It was shooting better slug groups at the lower pressure before. I learn a little but more every time I try something.

Thats the big thing for this gun— it wasn’t built for what it is now so ya your kinda the Guinea pig trying to get it right. You mention the hammer spring has a small effect im wondering if a heavier spring might help? Did you ever compare the hammer spring to the ghosts spring? Are they close?

 

[Billm]

Thats the big thing for this gun— it wasn’t built for what it is now so ya your kinda the Guinea pig trying to get it right. You mention the hammer spring has a small effect im wondering if a heavier spring might help? Did you ever compare the hammer spring to the ghosts spring? Are they close?

I haven’t compared them. I’ll try to do that.

 

[Madhatter]

In the last sentence of this post, I'm guessing that the correct spelling would be "shot some slugs"?

Unless he's chewing on lead......

 

[Billm]

So, i shot over 300 pellets through the Sonoran today. I didn’t attempt to shoot any groups until the very last five shots. I just shot at my 24’x24” steel plate at 101yds, not caring where they hit. I started at just below 140 bar and ended up at 170 bar. I used AEA 45 gr pellets to tune. Then I finished the day with an aimed five shot group using AEA 52.2gr slugs. I came away happy, but with more questions than I started with. The velocity would sit at around 870fps for most of the turning on the hammer spring. Eventually it would peak at 900fps and level out. As I turned the Allen wrench in, the tension actually felt lighter not higher. Then I would turn the wrench CCW to decrease the tension to hit the 3-5% of the peak. At around 870fps the felt tension actually increased as the velocity dropped. As the tension increased I got a drop in velocity and less muzzle blast (noise). I decided to settle on 870fps. The hammer spring on my other guns adjust how I would expect them to: as you turn the screw in, the tension increases as the velocity increase, until the velocity plateaus and eventually drops. Not bad news, just not what I expected. The good news: the 5 shot group with slugs was excellent in my opinion. I had a 6-10 mph 90 crosswind and did not correct for wind. 1.054 group . Considering it is a left to right string, it could well have been sub-MOA with no wind. Close enough for Bills work. Hopefully I have enough pellets for the pumpkin challenge. No, I’m not looking into the barrel!

 

[Billm]

So in my neophyte opinion, velocity is not the issue. These slugs worked fine at 833fps. I will swage some starting at 49gr up to about 55gr and see what happens.

 

[Solo1]

Well i glad you’re finding out what you need to do to get the kind of results you want. Nice group!

 

[Billm]

Well i glad you’re finding out what you need to do to get the kind of results you want. Nice group!

If it’s repeatable. I sent BRK an email asking about the regulator pressures for both the Ghost HP and the SniperXR, but they haven’t responded yet.

 

[Solo1]

If it’s repeatable. I sent BRK an email asking about the regulator pressures for both the Ghost HP and the SniperXR, but they haven’t responded yet.

You will probably get a quicker response with a phone call to shane I believe it is

 

[Billm]

This is my second Sub-MOA barrel. The lands appear to have been mostly honed away.

 

[Solo1]

Well they are supposed to be the premier airgun barrel maker! Lol. And i had to grind down the breach end to get a mag to fit. High tolerance work!

 

[Billm]

Well they are supposed to be the premier airgun barrel maker! Lol

I don’t know what to think when I look at this bore. I can barely see where the lands were. Is that a groove along the side of the land? I’m hoping the weather will improve so that I can shoot it sone more.

 

[Solo1]

And people complain about Chinese barrels!

 

[FL22]

This is my second Sub-MOA barrel. The lands appear to have been mostly honed away.

I would be interested in what @Franklink thinks about it.

 

[Franklink]

I would be interested in what @Franklink thinks about it.

Couple thoughts...
Not having bore-scoped good versus mediocre versus poor barrels personally, I don't have any sort of baseline for how one looks versus how one shoots.

Macro photos can make anything look pretty bad. Take a random pellet out of a tin and take a really close magnified photo of it and you'll see what I mean.

Finally....how it shoots is the end-all, be-all. I'm much more concerned with whether or not a barrel consistently puts my projectile where I want it to go than I am with how it looks under a magnifying glass.

 

[Billm]

Couple thoughts...
Not having bore-scoped good versus mediocre versus poor barrels personally, I don't have any sort of baseline for how one looks versus how one shoots.

Macro photos can make anything look pretty bad. Take a random pellet out of a tin and take a really close magnified photo of it and you'll see what I mean.

Finally....how it shoots is the end-all, be-all. I'm much more concerned with whether or not a barrel consistently puts my projectile where I want it to go than I am with how it looks under a magnifying glass.

Left To Right: new barrel, original barrel, new bore, original bore, original barrel, new barrel.
The lands are almost non existent in the new barrel, the lands appear to only have one well defined shoulder. In the images looking down the bore, the lands are plainly visible in the original barrel, in the new barrel they’re not visible at all.

 

[FL22]

I was interested in the rifling, I remember bill saying that the barrel was a hybrid type for both pellet/slug. But I can see the way that conversation is going to go.

I don’t think it’s a bad thing to have more information and understanding, good thing PA has some info about it at least it’s a place to start.

The invention of rifling: Part 2 | Blog | Pyramyd AIR

by Tom Gaylord Writing as B.B. Pelletier Part 1 The history of airguns This report covers: Fine rifling The Trapdoor barrel Bullet deformation is bad Pope's muzzleloading breech loaders Dr. Hudson Airguns and rifling Twist rate Diabolos and twist rate One last question answered Summary I am...

www.pyramydair.com

 

[Billm]

Here are two AEA .30 45gr pellets pushed through both barrels. There is very little evidence of land engagement on the new barrel. I’ve shot a few groups at 100yds. but it’s too windy to really get a fair account of how it’s doing. One group of slugs was huge lol.