1. The Forum Rules have undergone some minor changes and updates.  Please take the time to read them; it will only take a couple of minutes of your time. By doing so, you lessen the chance of incurring the wrath of the moderation team or making yourself look foolish to other members.

    90% of users posting adverts in the Sales forums need to be reminded to read the rules as their posts are wrong.  This is unnecessarily time-consuming and will no longer happen - if your advert doesn't follow the Sales Rules it will be deleted and you'll have to start all over again.

    To close this box once you've read it (and the Rules), click on the X in the top right-hand corner.

    Thank you.

    AGF Staff



    Dismiss Notice
  2. A reminder of one of the Forum Rules:

    'Behaviour

    Do not make inappropriate or offensive posts - including threats, harassment, swearing, prejudice, defamation, deliberate insults or name-calling, other negative remarks about this forum, its moderators and administrators or your fellow members. Even if this is just your own personal opinion, RESPECT YOUR FELLOW MEMBERS.'

    There have been changes made to our censoring software in an attempt to help with this growing problem.

    Click the X in the top-right-hand corner to dismiss this notice.
    Dismiss Notice
  3. Dear members,

    Our membership (like our country) consists of people from all walks of life; different in far more ways than can be listed here and each with a different view based on their experience of life - regardless of their colour, religion or cultural heritage. Every single person in the UK has been born of mixed race – we are a multi-coloured and multi-cultural country.

    As many of you are aware there are a handful of individuals amongst this membership that persist in making provocative, inflammatory, racist and otherwise offensive comments. This has been happening across the forum to a certain degree but is most especially prevalent in the Adult section.

    The moderation team has tried to stay on top of this, however unfortunately because of the ‘offensive’ nature of much of its content we don’t monitor the Adult section quite as much as perhaps we should. As a result much of this behaviour has gone unnoticed unless it has been reported to us. While the team always intended to take a "light touch" approach to the Adult section it would seem that some people aren’t quite adult enough to be left unmonitored after all.

    This behaviour is, and always has been against Forum Rules as well as the specific stipulations of the Adults forum and it will no longer be tolerated. We feel it's time to draw a line in the sand and as such from this point onward offenders will receive an immediate and permanent ban from the forum.

    In order for us to achieve our goal of restoring the forum to the friendly and tolerant place it once was, we ask that ALL members be mindful of the content they post and help us to stop unacceptable behaviour by using the 'Report' tool at the bottom of any offending post - the results of which can be seen only by Admin/Moderators.

    You should all receive a copy of this message by PM. 

    To close this message box, click on the 'X' in the top-right-hand corner.

    Dismiss Notice
  4. Hotmail block emails from us entering your inbox. Unless you can setup a safe sender you will not get activation emails from the forum. Please use an alternative provider or complain to Hotmail.
    Hotmail addresses include.

    @Hotmail.co.uk @Hotmail.com @outlook.com @Live.com
    Dismiss Notice
  5. Postings on Politics, Religion & Controversial Off-Topic Material

    The majority of users do not want to read about these subjects and people have left the forum as a result of it – this is after all an 'Airgun' Forum. It’s all very well to say they don’t have to read it if they don't want to, but as most of us use the ‘New Posts’ button there is no easy way to avoid it.

    All AGF staff members are in favour of people being able to discuss what they want, but we have to draw the line somewhere if it is upsetting other users. We don’t want to read about these topics either.

    IMPORTANT- The discussion of politics and religion is no longer allowed anywhere on the forum (including the Adult section).  The only exception is if it's airgun related - they must be put in the Airgun Related Politics section..

    We will not tolerate bullying or personal attacks, racism or any other offensive 'isms'. we will remove these topics from the forum, we will not give you an area where you can abuse each other. We will not hesitate to ban offenders.

    To clear this text box, click on the 'X' in the top right-hand corner.

    Dismiss Notice

Huma Regged Bsa Ultra Se .177

Discussion in 'Technical' started by robs5230, Jun 14, 2019.

  1. robs5230

    robs5230 If it's a springer, it will be oversprung

    Messages:
    6,715
    Likes Received:
    5,472
    Location:
    bideford devon
    Just installed a Huma reg in my new .177 ultra se.

    I had some challenges on the last one I did rather similar to @Wing-span experienced in his recent thread, namely high air usage https://www.airgunforum.co.uk/community/index.php?threads/huma-regulated-bsa-ultra.269229/

    the 2 real issues I had on the last one were that the 1.2 spring supplied by xtx was only 40mm long. I sourced a 45mm spring from Tom Nelson. The other was the supplied TP was 4.5mm. I re drilled a standard one to 4mm. Shot count ended up just over 40 from a 230 fill.

    I had a good read of a thread where @cloverleaf also regged an Ultra and requested some different things to the normal spec from XTX.

    Namely, the reg to be set at 100bar (normally 90-95) and a 3.5mm TP rather than a 4.0mm.

    My air cylinder is running low so only managed to fill to 200bar instead of the 232-240 I would fill to with a regged rifle.

    Set this one up for JSB express (and tested safe with exact 4.53) and had some rather pleasing results.
    40 shots from 200 to 100bar - If I can't get another 10-20 when filled fully I'll stand hanging.

    Express have never been the most consistent of pellets over the chrono for me and even springers have recorded variations up to 20fps. But as we know, consistency over a chrono doesn't alwayys translate to accuracy.

    30 out of the 40 shots were recorded with no more than 8fps variation. These are evenly and randomly spaced over the string of 40 and between 792 and 800fps. 7 were under 792 (lowest being 785) and highest 809.

    I'll use an average of 795 for pegging power which is a shade over 11 with express.

    Highest recorded shot over a 10 shot string mid fill with exact was 780 which is approx 11.4.

    I don't have any heavys but will test with them. And will adjust accordingly if needed.

    Its quiet. Like twice as quiet as it was yesterday making 800fps, so after adjusting, air wastage is now at a minimum or none.
    No hammer bounce and looks to be on for giving a lovely shot count over the fill.

    At 100 bar, there is a gentle drop off of power. No spike at all.

    Mounting a scope now for some group testing. I briefly tried yesterday and express were very good.
     
    Tim_B, Wing-span, jps norton and 3 others like this.
  2. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

    Messages:
    15,869
    Likes Received:
    6,781
    Location:
    Oxfordshire
    Good work - sounds about right given my own experiences if you're on course for 50-55 shots per charge from 230bar :)

    I'd be a bit concerned by those consistency figures though - is it any better with another pellet? If not I'd be looking at potential rifle-specific causes such as the breech seal or striker assy..
     
  3. robs5230

    robs5230 If it's a springer, it will be oversprung

    Messages:
    6,715
    Likes Received:
    5,472
    Location:
    bideford devon
    Well it doesn't get any better than this.
    Mounted the Vortex Diamondback 2-7x35 rimfire (Parallax corrected at 50 yards, duplex ret)

    5 shots got get on point of aim and then a further 10 shots all through the same hole :D
     
    Tim_B and cloverleaf like this.
  4. robs5230

    robs5230 If it's a springer, it will be oversprung

    Messages:
    6,715
    Likes Received:
    5,472
    Location:
    bideford devon
    At the minute I'm not sure where the consistency issue is Mike. Though accuracy is more than acceptable.
    I've never found express that consistent anyway out of anything.
    I'm more surprised it actually shoots express this well. My other 2 don't. Possibly a batch thing but I have alot of these so happy.
    I did order a stainless probe for this but it does need to go back to be remachined as it doesn't fit the pellet tray / guide I may well have marked that trying to close the stainless probe home but its no biggy.

    It did offer more consistency with higher preload on the hammer spring yesterday, but was less efficient on air.

    I can deal with how it is at the minute for sure though. Can't get any better than every shot through the same hole.
     
  5. Wing-span

    Wing-span Engaging Member

    Messages:
    204
    Likes Received:
    88
    Location:
    Huntingdon, Cambridgeshire
    Tested mine tonight and zeroed in the scope. Very happy as I did have a ragged 7 shot, 3/4 inch hole at 40yards. So that I am satisfied with that.. it is just that the bolt and probe became stiff during the testing almost as if the temperature drop through firing off numerous rounds effected the tolerances. In reality I don't think it will be that, possibly the bolt seizing against a ball detent or what? I will have the strip the action down to check it out. Any ideas?
     
  6. robs5230

    robs5230 If it's a springer, it will be oversprung

    Messages:
    6,715
    Likes Received:
    5,472
    Location:
    bideford devon
    Oh dear.
    I'd suggest a worn probe. The factory probe is nickel plated. The detent ball for the bolt lockup wears the probe and the nickel starts to come off. Bolt starts to be stiff to operate and another telltale sign is tiny little shiny flecks around the rear of the probe / bolt handle and around the mag well.
    If the little slotted screw that covers the rear upper breech screw is done up too tight (further than flush) that also puts pressure on the probe and will induce wear.
    I'll always fit a stainless probe as a matter of course now. Having said that, the one for mine has to go back and be altered a little.
    You can order a probe from Darrin at XTX or Rancid Tom (Tom Nelson) on the BSA owners group.

    To check whether the probe is worn, its a full strip. You need to remove the breech from the cylinder and turn the breech upside down. Remove the banjo bolt and slide the probe out of the rear of the breech. If you don't take it fully out, the area that gets most wear remains hidden under the breech.

    A worn probe looks like this. When the probe does shed the nickel plating it can destroy seals and will certainlly not do the barrel any good.
    PROBE3.jpg
     
    Tim_B, Tadpole and phil.m like this.
  7. Wing-span

    Wing-span Engaging Member

    Messages:
    204
    Likes Received:
    88
    Location:
    Huntingdon, Cambridgeshire
    Thank you for the information. I have it sorted easily, as it was a loose cocking pin bolt. It had loosened up enough to rub against the cylinder body and caused friction and therefore a stiff cock action.. so to speak.
     
    robs5230 likes this.
  8. robs5230

    robs5230 If it's a springer, it will be oversprung

    Messages:
    6,715
    Likes Received:
    5,472
    Location:
    bideford devon
    Glad you found that. I actually had this happen on one of mine a couple of years ago and forgot about it.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice