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. No longer allowed 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- We now do not allow political and religion threads anywhere on the forum (including the Adult section) unless Airgun related and they must be put in the Airgun related politics section..

    Staff will not move posts for you if you put it in the wrong section – it will simply be deleted. You will then have to type it all out again and put it in the right place, so heed this warning.

    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

Acceptable Fps Spread

Discussion in 'Technical' started by hughlle, Mar 6, 2019.

  1. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    Still poking my impact.

    Over 30 shots, the min and max were 763 and 782, so a spread of 19fps with a standard deviation of 5.3fps

    I've also found the paperwork from airfective, and they reported a min and max of 767 to 779, so 12 fps spread with a standard deviation of 3.8.

    How much of an impact on accuracy would those differences have? And anyone know what I should poke next to try and reduce the FPS spread?
     
    Rubio likes this.
  2. gasman

    gasman How do they know I've got Gas?

    Messages:
    15,542
    Likes Received:
    1,815
    Location:
    1066 country
    I’d say that’s about right, pcp?
     
  3. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    fx impact.
     
  4. gasman

    gasman How do they know I've got Gas?

    Messages:
    15,542
    Likes Received:
    1,815
    Location:
    1066 country
    Do a ten shot string then see
     
  5. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    Broken down into 3x10 shot strings, it's as follows

    Spread 13
    SD 4.57

    Spread 20
    SD 5.89

    Spread 10
    SD 4.32
     
  6. gasman

    gasman How do they know I've got Gas?

    Messages:
    15,542
    Likes Received:
    1,815
    Location:
    1066 country
    I’d say that’s ok
     
  7. jesim1

    jesim1 Big Poster

    Messages:
    3,308
    Likes Received:
    1,894
    Location:
    Wigan/St Helens
    Weigh and size your pellets, then you will know exactly how consistent your gun actually is ;):thumb:
     
    josh9465 likes this.
  8. hmangphilly

    hmangphilly Busy Member

    Messages:
    591
    Likes Received:
    215
    Location:
    wimborne
    How does it group chum ?
     
  9. mikey

    mikey Pro Poster

    Messages:
    5,129
    Likes Received:
    239
    Location:
    north yorkshire
    From my .177 unregulated bsa ultra se using unweighed pellets I got 60 shots with a fps of 17.i was happy with these figures.
     
  10. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    That's next on my list, but it's bucketing down right now. Prior to the recent poke, it was odd, would result in 3 different pellet on pellet groups from the same aimpoint.
     
  11. mikeyhall1

    mikeyhall1 Pepe Le Pew

    Messages:
    24,683
    Likes Received:
    19,929
    Location:
    Chelmsford/Upminster - Essex
    The Impact is regulated isn’t it?
     
  12. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    Yes. Why I was wondiering if 20fps might be cause for concern.
     
  13. mikeyhall1

    mikeyhall1 Pepe Le Pew

    Messages:
    24,683
    Likes Received:
    19,929
    Location:
    Chelmsford/Upminster - Essex
    I’d bloody say it’s a concern buddy!
     
    Blackmax, metalman and hughlle like this.
  14. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    As I say, when airfective tuned the rifle, they had a 12fps spread in 177 but only 7 in 22. Although as Jesim states, it could also be down to my pellets, and i know my current batch of exacts are fishy. Think I'll go run some magnums through and see what happens.
     
  15. Tim_B

    Tim_B Big Poster

    Messages:
    3,649
    Likes Received:
    2,195
    Location:
    Ipswich
    I usually approach things with anything under 20fps is nothing to worry about at 50 yards/poi. I think that regulated top end rifles should be single figures when tuned or up to 15fps out the box. From your strings above, if its grouping well then you have nothing to worry about.

    Weighing the pellets may give different results, as well as the way the you do the shot strings i.e. if you wait 20 seconds between shots, is it different? 1 minute between shots, is it different?

    I fell into this when I got my crown and wanted as low as number as I could get. I settles on around 10 fps and am happy with that. For my Tuned HW it is single figures. Ultimately I then went back to group sizes....if the group size is good out to 50 yards then I tend to worry less about the FPS.
     
    audi swift and hughlle like this.
  16. Tricky13

    Tricky13 Keyboard Hero

    Messages:
    2,409
    Likes Received:
    2,334
    Location:
    Kings Lynn
    I have been a bit preoccupied with pellet velocity recently and after a lot of testing i have come to the conclusion that in reality it make very little perceivable difference....my R 10 was running at around 770fps and now its at 730fps and its made no difference to my aim points at all its still exactly the same even at 60 to 100+ yards.
     
    Last edited: Mar 6, 2019
    David M, Jemsbro and Tim_B like this.
  17. mikeyhall1

    mikeyhall1 Pepe Le Pew

    Messages:
    24,683
    Likes Received:
    19,929
    Location:
    Chelmsford/Upminster - Essex
    Clean the barrel first mate, then re-lead with around 50 or so pellets. I’d still expect better even with unsorted pellets.
     
  18. hughlle

    hughlle Very Active

    Messages:
    4,276
    Likes Received:
    3,198
    Location:
    Somerset
    Just tried with some magnums, and both groups were a 10fps spread.
     
    mikeyhall1 likes this.
  19. mikey

    mikey Pro Poster

    Messages:
    5,129
    Likes Received:
    239
    Location:
    north yorkshire
    Is shot to shot in single figure fps..if they are then I would say the overall spread of the 19 you got would be nothing to worry abou
     
  20. Readie

    Readie Proud Member

    Messages:
    2,721
    Likes Received:
    1,743
    Location:
    Hampshire
    Well. last year I fitted a Huma Reg to my BSA R10 Mk2 FAC due to inconsistency problems.
    Below is the shot string measured with a Combro
    I'm well pleased with this bearing in mind I do not do any pellet sorting, just pick them out the tin and load, obviously if there are any squashed ones, they get binned, but I dont study the skirts of the Bisley Magnums.

    Also there will be a tolerance/accuracy of the Combro here too

    Seems to come off the regulator at 40 shots or so

    First 2 shots a little interesting .

    FPS Ft/Lb
    1 815 23.6
    2 880 27.5
    3 927 30.5
    4 928 30.6
    5 929 30.7
    6 928 30.6
    7 928 30.6
    8 926 30.5
    9 928 30.6
    10 927 30.5
    11 922 30.2
    12 926 30.5
    13 927 30.5
    14 927 30.5
    15 927 30.5
    16 929 30.7
    17 931 30.8
    18 926 30.5
    19 926 30.5
    20 928 30.6
    21 926 30.5
    22 928 30.6
    23 929 30.7
    24 926 30.5
    25 928 30.6
    26 929 30.7
    27 928 30.6
    28 929 30.7
    29 920 30.1
    30 928 30.6
    31 924 30.3
    32 927 30.5
    33 928 30.6
    34 928 30.6
    35 928 30.6
    36 926 30.5
    37 927 30.5
    38 929 30.7
    39 926 30.5
    40 922 30.2
    41 920 30.1
    42 919 30.0
    43 914 29.7
    44 914 29.7
    45 909 29.4
    46 905 29.1
    47 904 29.0
    48 900 28.8
    49 894 28.4
     
    metalman likes this.

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