Brocock Elite Contour S6 takedown and rebuild

Forums PCP Airguns Brocock Elite Contour S6 takedown and rebuild

  • Views : 1635
  • Link

    bobseagles
    Participant
    Member

    Despite all the new bull pup style PCPs on the market, I decided to look for something else light weight and short. I ended up buying a new 2014 Contour Elite S6. Sorry for no photos. I may put a few up when done. Nonetheless, here is my story. I checked the internet for takedown videos, and only found 1 which only removed the trigger, stock and shroud. Parts seem only to be available though AOA.  Despite this, I forged on.

    The 2014 Elite Contour in .22 has a 12″ barrel, a shroud which doesn’t help with noise reduction, a blade style air fill, a gauge at the end of the air tube, and a walnut cut out style stock, but not the one on the AOA website. You can see a picture of it on Top Gun Airguns. It weighs 4 lbs and 14 ounces, and has a 6 shot magazine. When I tried to put air in it, the blade style air fill kept flying out. When I did get air in it, it shot the 15.89 grain JSB at 685 FPS.  I mounted a Lucid 4-16x, which only weighs 18 ounces, and was able to keep the total weight under 6 pounds. Accuracy for the 13.43, 15.89 and 18.13 JSBs was terrible, shooting about 5/8″ for 5 shots at 20 yards. But it is cute.

    So, it was time to dismantle the new toy and improve it. After firing out the air, I removed the action from the air tube assembly. The barrel is epoxied in, and required heat to pull the barrel. I also had to heat up the bolt to soften up the glue locking in the rear screw. What a pain. I put the barrel back in temporarily and loaded a pellet to check the seating depth. Half of the pellet hangs out the back of the barrel. Gee whiz. The bolt probe tip is simply too short. I checked the Lothar barrel, and the muzzle has no choke, and inserting a pellet in the tip of the barrel met with almost no resistance. I skipped removing the power valve at this point. It looks like you need a long extension  socket to screw the mechanism out the back end. The hammer length is adjustable, and spring load is not adjustable.

    I cut off the probe tip, and drilled and threaded a 3mm hole, and made a new tip from a 3mm cap screw on my lathe. I was able to add only 1.6MM length. Any longer and you can’t use the magazine. I also discarded the blade style air fill mechanism, and made a 4 inch extension for the air tube of 7075 aluminum. I put a foster fill on the end, which makes air filling easy. I had a new Lothar Walther barrel with the same diameter, and cut it to 14.5 inches to replace the lousy one it came with. I drilled and threaded three small holes in the underside of the action to enable the barrel to be held in without epoxy. I also cut turned barrel so that it would have minimal clearance when sliding into the action.  I opened up the .087″ air supply hole in the action to .120 inches. The transfer port is .125 inches, which is optimal for the .22.  I put it back together, and fired a few shots to see the results, before building a new shroud. Velocity for the 15.89 JSB is now about 765 FPS, so it is now a 20+ ft lb gun, and I can get about 15 shots before the velocity declines. The air tube can only hold about 115 cc of air, and that includes my extension. You can fill it to 200 bar, but I only filled it to 190 for testing. Accuracy through the magazine was now better. It shoots about 5 shots into .175 inches at 20 yards. Without the magazine it shoots about .125 inch at 20 yards.  I have not yet adjusted the hammer length.

    I have a counter bore coming via mail, and will cut about .035″ from the barrel port in the action to enable the barrel to seat deeper, and to fully seat the pellet into the rifling.  I also will build a shroud and the final length will end up being about 35 inches. The weight with scope and mounts will be 6 lbs, which is still very light weight. After enabling the pellet to fully seat, and making hammer length adjustments, I should be able to get it to shoot .100 inches or better for 5 shots at 20 yards.  Why am I bothering will all of this work….it is cute !

    Rob

    Link

    30cal
    Participant
    Member

    Great story! Thanks for sharing. I would love to have one of those one day. Be nice to see a pic or two if you get a chance.

    Link

    spysir
    Participant
    Member

    Yes, pictures please,  you never know when some “good deal” might come along and this type of information is very helpful  teaching folks what they may need to look for if considering one. 
     Any idea if they all are like yours ( esp. the barrel & probe & seating depth) or you have one made on a cold Friday/

     Please keep us posted  as you move along.

    John 

    Link

    bobseagles
    Participant
    Member

    To Spysir:  It is possible that I got a bad barrel, but I don’t think so for the seating depth. The design of the action does not permit a longer probe than my replacement. Also, the beginning of the barrel sits only about 0.100″ from the air supply hole from the air tube below it. The barrel does not have a hole it like most other PCP designs.  For this Brocock, there is a small air chamber between the end of the bolt (excluding the probe tip) and the beginning of the barrel. The air supply hole is between these 2 points. 

    I did some further testing today, and the “honey moon” accuracy has declined somewhat. I shot JSBs 13.43s, 15.89s and today 18.13s, and the 18.13s won hands down. I think this is because the pellet is filled with more lead inside and the probe seats it deeper. Even with the 18.13, I estimate about .025″ of the pellet’s skirt is not seated yet.

    More later. Thanks for reading my article.

    Rob

    Link

    hawken54
    Participant
    Member

    Wow, This is interesting. I have an S6 and it seats them nice. Pellet on pellet at 30y with the 18s. Only trouble I have is every once in a while it wont index the mags all the way, need to jack the bold twice to get it to rotate all the way, but that is only every once in a while. Ill be watching. Would really love to see some pics also. Must have been a bad day at Brocock. Not a lot of stuff done on the Contour, especially tear downs. The more you can put out to us the better. And Thanks ahead of time!

    Link

    HauntedMyst
    Participant
    Member

    Agreed!  Pics please!  

    Bob, was the Elite sold to shoot at higher than the speeds you were getting?   I had an earlier Contour and it was decidedly a lower power gun at around 16fpe, which was consistent with AoA’s review.    I know the new Compatto can be cranked up to around 30fpe but didn’t think they had done that with the Elites.  

    Hawken, curious what power you are getting from your S6.  

    Link

    hawken54
    Participant
    Member

    Mines an older one and its running @16. be nice to push it up to 18 or 20 but its my daughters rifle and its shoots so accurate now Im not sure I want to mess with it. Be nice to see how to though.

    Link

    bobseagles
    Participant
    Member

    The rebuild saga continues:

    After reseating the new barrel about .065″ deeper into the action, all JSB pellets now fully seat inside the barrel. I have begun to make hammer adjustments, and accuracy seems to be the best with the 14.3 JSBs. I am getting 785 FPS with the 14.3s, which is 19.6 fl lbs. with the only modification of opening the hole in the action to .120, which is just slightly smaller than the brass transfer port, which is .125″.  Yes, this is the Elite model, that the factory specs list the power at 15 ft lbs.  Accuracy at about 20 yards for 5 shot groups is less than .250″, and needs fine tuning yet, but is getting consistent – a definite improvement. I fire 1 pellet at 1 mini bullseye (aspirin sized circle) at a time, and then go to the next mini bullseye from left to right to track the groups pattern. I will keep making minor hammer length adjustments until the group size is as small as I can make it. I am filling to 185 bar and shoot down to about 135 bar. This air gun is unregulated, but 15 shots have a total velocity spread of only about 10 fps, which is pretty good. The shot string starts at 780 climbs to about 790, then back down again. The air tube holds very little air, so I am pleased with the air consumption. I won’t put a regulator in the air tube because the regulator will take up too much space. With my extended shroud, scope, rings and magazine it weighs only 6 lbs 3 ounces. I will end up shortening my replacement shroud, but its prototype length takes the little Brocock to 38 total inches. Shooting indoors,  it is about as loud as a Daisy Red Rider.  Despite the action being not as smooth as a Theoben, FX, BSA or others, and despite the magazine design which is not as nice as a BSA or Daystate, this lightweight Brocock is growing on me. 

    Link

    bobseagles
    Participant
    Member

    Here is my final story on the rebuild. I won’t be putting pictures up because I learned today that you have to load them to other websites, and link them. I really don’t want to put pictures up on other sites…sorry…

    I replaced the air tube extension that I made with a longer one, also made of 7075 aluminum, and was able to increase the volume by opening the internal diameter by using a thinner o ring. The air tube total length is about the same as the XL version of the Contour. It is hard to see the line between the end of the old air tub and the beginning of my extension. I was able to remove the valve body with an extension and a 5/8″ socket. The valve body has a socket style head which when tightened, pushes out an o ring to seal the valve body in the airtube. After unscrewing the valve body cap, and after removing the 2 screws visible along the air tube sids, you can push the valve body out. I found that the valve return spring had a miniature shim against it shaped like a horse shoe blocking air flow from the air supply side. This a power restrictor. I replaced it with a washer of the same diameter with an unrestricted hole in it. The result is that it now shoots at an average of 815 fps with the 14.3 JSB, which is 21 ft lbs. Small power compared to many other PCPs these days, but it only has a 14″ barrel, and gun + scope weighs just over 6 pounds.  Although I am not done with adjusting the hammer, I am getting 5 shot groups of .100 to .200 at 20 yards. Adjusting the hammer strike length of .001″ makes quite a difference in accuracy.With a shroud that is only 3/4″ in diameter, firing it indoors it is barely louder than a Daisy Red Ryder. However, stopping all that air caused quite a muzzle jump.  My last modification was to make another shroud end cap, and drill 6 air exhaust holes into the sides. The result is that the muzzle jump is minor now, with no increase in noise.I have put about 50 hours of work into this thing…replaced the barrel, built a shroud, built an air tube extension, switched to a foster fill, modified the valve body slightly, replaced the probe tip, and dealt with a variety of issues. I like the result. With scope and rings, it is just over 6 pounds, is accurate, quiet and handy. In hindsight, I would rather work with a BSA action, magazine, valve mechanism and barrels. What captured my eye with the Brocock was the light weight, size and skeletal stock. I am considering “mini-sizing” a BSA Scorpion next. Thanks for reading my write up. 

    Link

    spysir
    Participant
    Member

    Wanted to thank you for taking the time to post all this information!   Sounds like that one is a fine airgun for a person with your skill set but perhaps not for me, appreciate the knowledge.

    John

    Link

    HauntedMyst
    Participant
    Member

    “bobseagles” In hindsight, I would rather work with a BSA action, magazine, valve mechanism and barrels. What captured my eye with the Brocock was the light weight, size and skeletal stock. I am considering “mini-sizing” a BSA Scorpion next. Thanks for reading my write up. 

    
I get that!  Working on a BSA is like working on VW Bug, everything is right there and logical.  I’d be interested in your mini sizing the Scorpion.  Are you considering a Scultra or even smaller?   I’m going to be building a compact R-10 with an Ultra barrel but with none of the custom work you do.  Should make a great squirrel gun.

    Link

    bobseagles
    Participant
    Member

    Thanks very much for the positive comments about my write up. I own a .22 BSA Scorpion, that I switched out the stock to a T10 style and put a shroud on it. I don’t like the really high comb on the standard stock. My plans are to go with the synthetic green stock to start (see Airgunspares.com), put a BSA 15.25″ barrel on it, replace the brass valve body with my own made of 7075 aluminum. This will cut the weight about 10 ounces. I will use a Lucid 4-16x because it weighs 18 ounces. I will put an aluminum air tube on it made of 2024 aluminum for further weight savings. I will consider making a skeletal stock on it like the Brocock Elite 2014 (really like the low weight), and expect about 28 ft lbs. I should be able to get the weight to 7 lbs with scope, and I KNOW it will be accurate. There are many decent barrels out there, but I am use to getting .050″ to .075″ center-to-center 5 shot groups at 20 yards through the magazine with BSA barrels. Air guns are addicting !

    Link

    jp_over
    Participant
    Member

    Old thread but excellent info – thanks Rob!

Viewing 13 posts - 1 through 13 (of 13 total)

You must be logged in to reply to this topic.