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Brocock/BRK BRK Ghost Wheel only lowering FPS by 10
- Thread starter Triggs75
- Start date
Oh those are quite skinny, I have another one similar.
.416" OD, 1.96" OAL, .047" wire diameter. This one would probably work perfect in the brk.
-Matt
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Probably the 0.047"
With a 128 bar reg pressure, the 0.047 was around 650fps on MIN and 870-880fps on MAX with the 0.20/18.9gr NSA slugs. Major difference being the .20 barrel has a bigger transfer port and larger cross section projectile for the air to push on. Just an example of the change in fps available from the wheel when the gun is adjusted with that in mind.
For your 23" 0.177 barrel, I would think a reg pressure around 120-130 bar and a 0.047" wire diameter hammer spring will give you the largest variance in fps when spinning the power wheel. That goes for pellets/slugs in the 10-13 grain range. And the OEM transfer port size is probably best for this weight.
If you're thinking of shooting slugs/pellets in the 16-20 grain range you might need the 0.051" wire hammer spring. It takes a lot of oomph to push the heavy .177 projectiles. If your primary use is gonna be heavy .177, you might talk to your machinist buddy about making that tp oval for better air flow.
My Ghosting has been with the shorter (Carbine) .177 barrel, a 18" .20 barrel, and a 23" .22 barrel. For long barreled .177 Ghosts, probably nobody out there that could advise you better than @SorenDrost. Hopefully he'll see this and chime in. The best information comes from guys with first-hand experience.
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Verify the inner diameter as well. See my photo in post #14 here. That second photo shows the cone shaped spring guide that fits inside the hammer spring. If the inner diameter of your replacement spring isnt big enough for that spring guide, it won't work in the Ghost.
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Talked to Soren on the phone this morning. Ill go for a delta wolf performance (or ghost perfomance) as soon as they are out. Longer barrel, bigger transfer port and thinner pinprobe.
He recommended the HP1 spring for finetuning and the one below that for tuning. So ill try find those or equal
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Spring ID = spring OD - (spring wire diameter*2)
The one I linked would be .296" ID.
The one your gun currently has is .273" ID.
What the spring guide diameter is? IDK.
Either way, it will work fine...and, spring guides can easily be bushed larger or reduced with some sand paper and a drill bit, don't fret about that dimension...ideally you don't want that guide to create friction and a slightly loose fit is better than tight.
-Matt
The one I linked would be .296" ID.
The one your gun currently has is .273" ID.
What the spring guide diameter is? IDK.
Either way, it will work fine...and, spring guides can easily be bushed larger or reduced with some sand paper and a drill bit, don't fret about that dimension...ideally you don't want that guide to create friction and a slightly loose fit is better than tight.
-Matt
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