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Rm8 Varmint Uc .22

Discussion in 'Anything Airgun Related' started by Jpaddyb, Jun 20, 2020.

  1. Jpaddyb

    Jpaddyb Member

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    Hi all,

    I'm new to the group and air rifles however have been shooting full bore since I was a teenager. I've recently purchased a Walther RM8 UC in .22

    I initially zeroed in when there was around 100 bar of pressure in the tank, when I topped her up to 200 i noticed a huge shift in zero. Now today I've shot her down to 100 bar and again seen a shift from the zero at 200 bar. Once topped back up the zero was bang on again.

    For anyone with a .22 RM8 could you let me know if this is usual? I know this rifle spilts opinion on here but any help would be great, my initial thought is that its the regulator affecting it.

    Cheers in advance.

    James.
     
  2. willo1962

    willo1962 Keyboard Hero

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    What do you call huge? Most people shoot down to about 100 bar and then refill. I fill my Ultra to 180/190 and shoot to about 100/90 and only see about 1cm or less change in POI as the power drops. I get about 50 shots so about 2 bar per shot
     
    Jpaddyb likes this.
  3. Jpaddyb

    Jpaddyb Member

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    The first change in zero was about 15 cm, the second one this morning was only about 2 -3 cms. But thanks, I'll have to keep an eye on my gauge a little bit more :)
     
    willo1962 likes this.
  4. chuggypop

    chuggypop Marmite - I'm undecided.

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    That's not good when you consider that she's regged.
     
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  5. Jpaddyb

    Jpaddyb Member

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    If it persists ill be taking it in to get looked at i think.
     
  6. magicstu

    magicstu Well-Known Member

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    Just wondering if you’re going below the regulator pressure, that would be my guess, so it’s unable to work I’ve got the .177 and only shoot down to 120 ish and don’t have a problem. It was pretty consistent on the chrony to that and was more than enough shots for me But as it’s my rough gun I haven’t taken it down to 100 bar I just top up to 190 when it’s below150.
     
  7. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    That's pretty shocking.. FWIW a .22 should have a reg setupoint below 100bar so the POI shift shouldn't be a case of dropping off reg.

    My advice would be to get it on a chrono and test over the full fill pressure range to ensure that it's a velocity-based issue, then (assuming the rifle was bought new) take it back, get a refund and put it towards a better alternative.
     
  8. Lordy 74

    Lordy 74 Keyboard Hero

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    My rm8 is .177 . I get about 110 consistant shots then the power noticeably drops off . As i say shoots 110 7.9 grain pellets consistantly at around 800 fps , so 11.2 ftlb . You can tell when you need to fill up because the drop off the reg is very noticable . If you are getting a good shot count , you should be getting more than me in .22 , then theres nothing to worry about its just thats when you need to refill . It should be between about 90 and 100 bar when this happens . .

    Like clover says , check with a chrono . If you preload the hammer spring on these then it significantly changes where it drops off the reg . It brings it up a fair bit . Depending on the preload and im talking only 5-6 mm the point can be up at 115 bar so check its not running hot
     
    Jpaddyb likes this.
  9. TinCan Tony

    TinCan Tony Can I video that?

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    I used to fill my .22 RM8 to around 210bar, but found it most consistant between 190 down to about 100bar - extremeley reliable and repeatable accuracy in this range.

    What pellets are you using? Initially, my RM8 was best with RWS Superdome's, but slowly went 'wayward' with them and I don't know why. I swapped to 5.52 AADF's and never looked back, although it really struggled chambering with 5.53mm ones.

    Is the rifle brand new and just needs the barrel leading up properly?

    Just a few thoughts. I know the RM8 splits opinion on here and I owned a very reliable one but, whatever you do, don't let @cloverleaf know. :D

    :thumb:
     
  10. TinCan Tony

    TinCan Tony Can I video that?

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    Damn it. You beat me to it. ;)
     
  11. Jpaddyb

    Jpaddyb Member

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    Cheers, yeah brand new, the shots inbetween 200 - 100 are more than accurate.
     
  12. TinCan Tony

    TinCan Tony Can I video that?

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    Put more pellets through the barrel. In my experience it will become very consistant after about 4 tins. :thumb:
     
  13. chuggypop

    chuggypop Marmite - I'm undecided.

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    And totally worn out after 5.
     
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  14. Bunny-on-Bunny

    Bunny-on-Bunny Posting Addict

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    I used to fill mine - full barrel .22 - to 180 and shoot down to 100, below 90 it would shoot a bit to the right.
    The regs in these guns are pretty slow, so if you're trying to lay down 8 rounds in 8 seconds, accuracy Will suffer.
    You could try cleaning the barrel, I did mine till dry patches pulled with a squeak, it took 60 rounds to lead-in and was not too fussy what passed through it so it got fed Remington T.H. domes.
     
    Jpaddyb likes this.
  15. Lordy 74

    Lordy 74 Keyboard Hero

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    What cal was yours chuggs ?
     
  16. chuggypop

    chuggypop Marmite - I'm undecided.

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    Mine was .22 ,my friend, although pretty sure putting .177 pellets in it wouldn't have made much difference - worst PCP i have ever had the misfortune to own and nearly did a little sex wee when I sold it.
     
  17. Jpaddyb

    Jpaddyb Member

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    Thanks, shooting bang on after filling up
     
    Bunny-on-Bunny likes this.

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