.308 Build
Ordered all the pieces from AF today so I can build my .308 Condor. Frame, trigger asembly, power wheel, fore arm grip. I have 28″ barrel and bigbore Blod valve. I will make everything else. Lathe is going to be here around 12:00 tomorrow. Can’t wait to start making things on a real lathe. I will then have .22 .25 and .308. Want to try and break 400 fpe with .308.
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Fantastic string there Doug! From an Airforce tank? or a 62ci
Did a shot string the othe day.
3400 fill
118 gr
980
968
963
959
948
946
940
935
931
927
918
910
907
900
900
893
887
882
18 shots
251.7 fpe down to 203.9 fpe
I thought you were talking about the breech.
It has a aliminum cover on it also.
The cover on the frame is for protection also. I’m sure it stiffens it up. The collar is where the frames flex is at.
It is a lot of work to do. 1.5″ bar. Machine the OD. Then bore it to 1.260″ to match the frame. Then cut it to fit the frame.
You know your valve is putting out when that happens 😯 😎
Remember children, always where safety glasses when extreme airgunning! 👿
OK doug, I know your tired. Now get some sleep, and when you wake up, re-read! 😆 What did you use to stiffen the breach AREA? 😉 😆
Mike
Doug, the frame stiffener not the breech slide 🙂
Yes I like that stiffinening as well.
Will incorporate that in the next Vulture build.
Your talking about the breech with it’s aluminum cover?
It is a cup I machined. The I pressed in some delrin then machined the hole and o ring groves. It is .070″ thick.
I machined a extra cup and had it anodized. I had this one anodized with the Delrin in it and the process did mess with the Delrin. I had the run a ream in the breech and clean up the hammer side o ring groove. Breech wouldn’t side on the barrel smooth.
I only did this cover on the .308 because the breech is thinner. I use just Delrin on the .257 and .25 and have no problems.
I did have a stock AF breech explode on me before.
Finally-Finally-Finally, some one has addressed the very weak breach area! well done Doug! This has been my pet peeve on this platform form day one. 👿
What size tube did you use for this, or did you machine a piece of bar?
Damed fine work Doug! 😉 😀
Mike
Looking good! But!
Doug: quit pissing around with the 308 and build the other guy’s .257” that got in line before me so I can eventually get mine!
I guess that me having you do some work for me in the last couple of years doesn’t have any influence on my place on your list?
HINT! HINT! 😆
Well it is finally done. Here is everything I had done.
Would have been great if they didn’t somehow mess up my shroud. Somehow they managed to get the last 3 pieces of the shroud stuck together and then anodize them. Instead of calling me and telling me they are stuck, they just went ahead and anodized it.
Amazing how you can’t get anything done right now a days. So now I have to make a complete shroud if I want to make it right.
Awesome job Doug!! That looks very solid!! You are going to make me spend more money aren’t you!?! I have that 12″ rail that I need milled and added to the frame.
Thanks Voltar
Yes I did figure out that the breech OD matters after I went .375″ on the .257. Could never get a .25 valve to work. I hade to use a .308 valve with smaller hole in the stem.
Right now .308 shoots 118 gr at 970 fps and and 158 gr at 870 fps. It has done 980 fps and 885 fps.
I’m building another one with a TJ’s barrel. 32″ 4 grove 1-14 twist.
Looking for 920-930 with 158 gr and 1020-1030 with 118 gr.
Beautiful, abslutely stunning work. Don’t know how I missed this project?!
Doug, here is my undrstanding of tank dump. When a valve can flow big air and the bore becomes a restriction (choke) then the pressure builds in the breech turning it into a pneumatic cylinder pushing on two pistons.
The barrel ‘piston’ is stationary, the tophat ‘piston’ is not. It is held rearward as in ‘open’ = tank dump.
A solution I use is to put a choke in the stem that acts as a sail to harness some of the flow to close the valve. Works great as I was getting tank dumps on my Vulture 308 without it.
Another consideration is the size the barrel is turned to. IIRC someone mentioned reducing to 0.375″ and that is good advice as it reduces the pneumatic force developed in the ‘cylinder’
Love your work and craftmanship! Well done.
Walter….
BTW still am a fan of the TJs barrel liners, the .458 is kick ass accurate and this .308 liner is working well so far! 🙂
Holy mother of all things sacred and innocent!!! 😯 😯 😯
I like the silver and black thing you got going there! 😉
That there is a Condor on roids!! 😈
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62 ci.
Going to do the .257 either tomorrow or Monday when I go shooting.