February 7, 2008 at 12:59 am #1476
I’ve been wrenching on a .177 setup for a couple weeks now and just today it started to show some promise! I started with a 25″ 16mm Target barrel from MAC1 turned the breach and tuned it for 900’ish fps. My idea was to cut the barrel down an inch at a time and shot for fps with the tophat staying exactly the same as well as the power wheel to soo how different barrel lengths effected power on a .177 @ 900fps/20 fpe. Well it turns out setting up the breach over and over is a SERIOUS pain in the ass so it got chopped in bigger chunks 😆
Mistake #1 turned the breach down a little too small cause after I got it smooth and all the scratches out it was .303! factory is .308-.310 so I am pretty sure I was getting some huge fps variances from this. I started smoothing my final breach on the 14″ barrel .315 and I ended up @ .311 with the breach slide working nice and smooth and shots much more consistant.
I was initially thinking I “might” keep the long barrel until I put it together with the shroud on it and it was like a frigging fishing pole! I LOVE the short compactness of the SS so I knew an 18″ barrel was where I was heading, even if I gave up some amount of shots to keep the gun short and handy. Then I undercut the breach on the 18″ barrel 😡 did some shooting and cut it down to 14″… so I wasted 11″ of a perfectly good match .177 barrel 😕 live and learn…
I put the muzzle bushing 1/2″ from the muzzle and the other in it’s factory spot for now. The muzzle one has a groove cut into the barrel that the o-rings fit into then a vented bushing presses on over them and is a friction fit into the frame. I’ll be doing something for the rear bushing but it is kind of complicated in that it needs to center the barrel as well as support the power wheel and keep the barrel from being blown out the front of the gun…still working a good solution for it.
For the moment stock hammer, spring, trigger parts(minus the “safety”) and breach slide although I have plans to make all new custom pieces for them as well as a new valve and 1,000CC bottle. The tophat keeps coming loose which is really annoying
Here’s some #’s from the 18″ & 14″ barrels and also from my .177 AirWolf. I was checking to see if maybe the Combro Chrony was f’ing up on me. Damn the Wolf is consistant!
18″ barrel .303 breach old o-rings
AirWolf .177 Kodiacs
18″ .303 breach new o-rings…hope this would help the undersized breach
14″ .310 breach
Pics coming later I can’t post or get to them from work…
Jim.February 7, 2008 at 8:44 pm #33389mikemvParticipant
oopsFebruary 7, 2008 at 8:45 pm #33390mikemvParticipant
Still nice numbers on your 14″. With the larger tank you’ll have plenty of shots I would think.
Thanks for sharing all that. Lots of work put into it ❗
Just about have to glue the grubs on the top hat. 🙁February 7, 2008 at 11:47 pm #33400volsr1Participant
Nice consistent numbers….Impressive! I thought about getting a .177 barrel and use in the FT hunter division. I just don’t think the trigger (even tuned by Anthony) is competitive unless there’s some other way of tuning that I haven’t heard about.February 9, 2008 at 12:49 am #33470
Got in another 49 shots today and crunched some initial numbers. At 17-19 fpe the .177 is NOT looking good efficiency wise 🙁 just as the world has said on all other .177 vs. .22 guns.
The numbers below were gathered over the last couple weeks/months and are made up of shooting a 12″ and 24″ .22 Talon setup with a stock valve and the tophat shimmed so I could shoot the gun at power levels from 8’ish to 20fpe.
stock Talon valve
Tophat set at .026″
Power Wheel varied from 5-11
fpe/psi__fpe__psi used__psi/fpe__psi/shot___% more efficient than .177
.546——767—-419——–1.8——-8.5———–Baseline 14″ .177
.369——1256—464——–2.7——7.6————11% ** Light valve spring????
This is really interesting so far…not happy at all about the low efficiency though. I’ll have to mess with some other setups and see what I can come up with…
❓ HOW does the AIRWOLF get 180 19fpe shots from the same(500cc) size tank? AND from only 190 BAR!!!
Jim.February 19, 2008 at 4:42 am #34323
testing fills from 180, 170, 160 bar…here is the string from the 160 bar.
If I loaded up with Crosman Premier lights I’ll be shooting in the 820 fps range with a string like this…
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