Brocock/BRK Ghost collaborative data request

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cavedweller said:
Great! Good info and thanks
Tony do you recall what caliber you bought your ghost as? Wondering about the spring
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The 30 was bought as a 30, the 22 carbine was bought as a 22 carbine. I do have a spring kit and used the black spring in the 30 for a while. I am not sure why I took it out. I will be testing the 30 soon with the tensioner on it also.

Tony P.
 
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pesty3782 said:
The 30 was bought as a 30, the 22 carbine was bought as a 22 carbine. I do have a spring kit and used the black spring in the 30 for a while. I am not sure why I took it out. I will be testing the 30 soon with the tensioner on it also.

Tony P.
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@pesty3782 what tension"er" are you referring to ? and thanks for the info.
 
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cavedweller said:
thanks
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Here's collaborative update (to today 9/6/24) i will continue to update as people provide more specific info:
Tuning the GHOSTS
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Modified Ghosts w/ .177 barrel (17 inches, 12 land and groove, choked, 1:17.7)
Franklink (Cole)
10.34s at 890fps (accuracy from the 10.34s best if kept under 900 with this barrel, and really goes south at 920+)
  • Flow through probe
  • 455grain hammer (skeletonized)
  • Preload adjustment about 1/8” proud of hammer body (threaded insert in nose of hammer on the earliest Ghosts)
  • 0.047” wire hammer spring
  • Regulator @ 105 bar
  • Hammer spring tension at MAX

17” carbine .177
low pwr spring (white)
power wheel on 5,
Regulator at 110 bar
shooting JSB 10.3’s @890 fps

high power version in .177,
reg set at 100 bar,
hammer spring white (low pwr)
power wheel on 5 for 910fps with jsb 10.3gr for around 19.5-foot pounds

Stock Ghost (factory)

17” Barrel, JSB 10.3, Reg @ 115/120, White L.P. Spring, pwr @ 2 @ 892 FPS <20 FPE

23” barrel, JSB 13.4, REG SET @115/120, PWR @ 6 white spring @ 813 FPS <20FPE

JSB 16.1’s need data ?

23” Barrel, Reg @ 115/120, Pwr wheel @ min, Med, max,
FPE ??

.20 barrel (18 inches, 12 land and groove, choked, 1:17.7)
Franklink (Cole)

(two “tunes” for this one, first is the target edition, second is the long range pester)

13.73s at 810fps on MIN

15.89s at 915fps on 11

18.9s at 870-880fps pwr wheel on MAX
  • Extended pin probe
  • 455grain hammer (skeletonized)
  • Preload adjustment about 1/8” proud of hammer body (threaded insert in nose of hammer on the earliest Ghosts)
  • 0.047” wire hammer spring
  • Regulator @ 126-128 bar
Or…

15.89s at 920-925 pwr wheel on “5”

18.9s at 910-915fps on MAX
  • Extended pin probe
  • 455grain hammer (skeletonized)
  • Preload adjustment about 1/8” proud of hammer body (threaded insert in nose of hammer on the earliest Ghosts)
  • 0.051” wire hammer spring
  • Regulator @ 122-124 bar

.22 barrel (23inches, 5 groove polygonal, choked, 1:30)
Franklink (Cole)

28.55s @ 960fps on MAX
  • Extended pin probe
  • 545grain hammer (non-adjustable preload with this hammer)
  • 0.051” wire hammer spring
  • Regulator at 150 bar
  • Hammer spring tension on MAX

From AOA YouTube:

23”barrel, .22 jsb, JSB 18 gr, white spring, reg at 140
Pwr wheel at min = 495 fps
Pwr wheel at medium 10 = 645 fps
Pwr wheel at max 20 = 760 fps

Switching to Yellow Spring, adjusting pwr wheel only:
23”barrel, .22 JSB 18 gr, yellow spring, reg at 140
Pwr wheel @ min = 870 fps
Pwr wheel @ 10 / med = 950 fps
Pwr wheel at max 20, = 980 fps
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Recent .22 find
Ghost XR Carbine - as received from AOA, factory spring used is this configuration is unknown.

JSB Exact Jumbo 18.13 @
902 FPS avg.
900 min. / 905 max.
Spread 5
Standard deviation 2
Regulator @ 100 BAR / Power Wheel on 10

.25 barrel (23inches, 5 groove polygonal, choked, 1:17
23” Barrel, 145 bar, red spring, PWR Wheel 5, 33gr JSBs @ ( fps? ) reports sub moa group at 50 yards
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.30 barrel (23inches, 5 groove polygonal, choked, 1:17

#1) 23” HP .30 barrel, 150 Bar, Factory black spring, PWR Wheel 9, JSB 44.75’s @880 fps - fpe

#2) 23”HP .30 barrel, 140 to 145 bar, factory black spring, PWR Wheel 12, JSB 50.15gr @ 875 fps ~ 85 FPE?

#3) 23” HP .30 barrel, Reg 140, Stock Spring Black, PWR Wheel 10, JSB 44.75) @ 895 FPS
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#4) 23” HP Barrel, Blk Spring, Reg 140-150 “using only power wheel” went from 673 fps to 873 fps 53 gr pellets
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PowderBurnt said:
I shot some 8.7s out of my new Ghost this morning. The regulator was factory set about 150 bar by my poor vision up close. The wheel was set to min. The pellet went sonic and spooked a neighbor's horse, even with the moderator.

I adjusted the reg to about 100. I'll try again tomorrow.
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Shooting that light of a pellet at that reg pressure = one hell of a crack.
Suggest reading the previous info on .177 tunes
 
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cavedweller said:
Here's a .22 Youtube video to enjoy:
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My results for a .22 HP 23" Barrel "Multitune" for 3 different pellet weights was similar to AimSmall on you tube.
.22 Barrel @ 23” Multi-Pellet Weight(s) optimum balance tune w/o spring or reg change.

White Spring, Regulator set to 115 Bar.

This is a great one barrel multi pellet weight tune and maximizes air usage. NOTE: older springs/newer springs may vary FPS results in addition to 3-5 shots to settle when changing power wheel setting – remember to only adjust power wheel with breech closed.
They these and only adjust the Power wheel as below using the pellet weights listed.

Min PWR 15 Gr at 895

Med PWR 18 Gr at 880

Max PWR 25 Gr at 870

let me know how your .22 behaves with this setup. I installed a new spring.
 
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@cavedweller,

Been considering a similar experiment, but with a slight shift down in pellet weight. Curious on a somewhat midweight .22 pellet weight "tune" using the 13.43/14.35/15.89/18.13/20.83s.

And mostly interested in how it'll behave with those pellets while using the same 105-110bar reg pressure that the gun needs for a 19fpe .177 "tune" for field target.

Been mentally planning on doing the above and sharing the results, but also comparing the impact points when going from the .177, .20, and .22 barrels.

Rudy, do you happen to have the wire diameter of the "white" spring you're using?
 
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Franklink said:
@cavedweller,

Been considering a similar experiment, but with a slight shift down in pellet weight. Curious on a somewhat midweight .22 pellet weight "tune" using the 13.43/14.35/15.89/18.13/20.83s.

And mostly interested in how it'll behave with those pellets while using the same 105-110bar reg pressure that the gun needs for a 19fpe .177 "tune" for field target.

Been mentally planning on doing the above and sharing the results, but also comparing the impact points when going from the .177, .20, and .22 barrels.

Rudy, do you happen to have the wire diameter of the "white" spring you're using?
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@Franklink i can take a micrometer to the white spring? never thought to.
Tuning wise, I think you will find when you jump to the 16 gr or 20 gr weights you will need reg pressure at 115/120 to take maximum advantage of the pwr wheel, at least with the white spring.
With the Blue spring the lower weight diablos will move too fast (IMO) and you wont have the same amount of worthwhile adjust-ability on the power wheel; oddly i even saw some diminishing returns when i was only using 110 on the reg... i didn't see the same adjust-ability i got from the 115 reg pressure (new spring) this was true in my 17" carbine and my 23" HP ghosts in .177 cal as well.

This is kinda cool, esp looking for that sweet spot for multiple weights. the .22 pellets seem to have the most choice / variety.
 
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cavedweller said:
@Franklink i can take a micrometer to the white spring? never thought to.
Tuning wise, I think you will find when you jump to the 16 gr or 20 gr weights you will need reg pressure at 115/120 to take maximum advantage of the pwr wheel, at least with the white spring.
With the Blue spring the lower weight diablos will move too fast (IMO) and you wont have the same amount of worthwhile adjust-ability on the power wheel; oddly i even saw some diminishing returns when i was only using 110 on the reg... i didn't see the same adjust-ability i got from the 115 reg pressure (new spring) this was true in my 17" carbine and my 23" HP ghosts in .177 cal as well.

This is kinda cool, esp looking for that sweet spot for multiple weights. the .22 pellets seem to have the most choice / variety.
Click to expand...

My rationale for those pellet weights in .22 is simply because I've got a decent supply of them and don't have a gun set up for them right now. For 30-35fpe I prefer .20 over .22, for the ballistic superiority. And for competition with the .22 I'm more into the Monster RDs at 50+ fpe. So my guns are set up that way, leaving a "hole" in the midweight .22 realm. But I've got quite a few tins of those midweight .22 pellets and might as well shoot em before they get oxidized up.

Yes please, I'd be curious to know the wire diameter of that white spring if you get a sec. I've got the "medium" and "heavy" weight springs from before the color coded kits. "Medium" being 0.047 and "heavy" being 0.051. I've also got a green? but haven't ever found a need for that heavy beast in my .22 and under endeavors. It's in a box somewhere so I'm not positive it's green, I just remember it being much heavier than my other two springs so I've never installed it.
 
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Franklink said:
My rationale for those pellet weights in .22 is simply because I've got a decent supply of them and don't have a gun set up for them right now. For 30-35fpe I prefer .20 over .22, for the ballistic superiority. And for competition with the .22 I'm more into the Monster RDs at 50+ fpe. So my guns are set up that way, leaving a "hole" in the midweight .22 realm. But I've got quite a few tins of those midweight .22 pellets and might as well shoot em before they get oxidized up.

Yes please, I'd be curious to know the wire diameter of that white spring if you get a sec. I've got the "medium" and "heavy" weight springs from before the color coded kits. "Medium" being 0.047 and "heavy" being 0.051. I've also got a green? but haven't ever found a need for that heavy beast in my .22 and under endeavors. It's in a box somewhere so I'm not positive it's green, I just remember it being much heavier than my other two springs so I've never installed it.
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Probably will not have a chance to put a micrometer on the spring Sunday 14 Sept. as I’m preparing a couple of people for a Saturday shoot.
 
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