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power tuning.

Discussion in 'Anything Airgun Related' started by jjmac, May 11, 2015.

  1. jjmac

    jjmac Active Member

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    hi there, just a query about the tuning of PCP rifles.
    I've had my rifle little over a week now, I've put about 700+ pellets through it, the majority of those being on targets in my garden.
    i have a few permissions and visited one the other day purely checking it out for a day hunting there this weekend. while there i spotted a few rabbits. Now even though i was only checking it out, i obviously took my rifle with a full mag :D

    i shot one rabbit at about 35 yards and it looked a perfect shot but it just seemed be scared off so i thought i missed. i checked my zeroing again on a target and it was spot on. the second rabbit was at 30 yards, perfect head shot just behind the eyes but was still kicking about and i had to snap the neck to kill it. this leads me to believe the rifle is considerably underpowered.

    im not a total noob, i had a super10 about 10+ years ago and regularly took rabbits at 40+ yards and it was around the 11.5 ft/lbs mark.

    is it just a case of taking it to a gun shop,, having it chronoed, then them doing a simple tune up to the legal limit, or is there more to it?
    for now i refuse to hunt with an underpowered rifle so want to get this sorted ASAP.
    thanks in advance.
     
  2. milek

    milek Honorary Member

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    A very noble stance for which I applaud you. Your idea of taking it to a gun-shop is sound; they will be able to tell you what it's running at. You might want to invest in a combro whilst there so you are able to test your rifle(s) yourself at your leisure. You have experience in hunting so it's unlikely to be anything else other than an under-powered gun.
     
  3. themadspread

    themadspread Donator

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    the experts say that 3 ft lbs of energy is enough to kill a rabbit but i dont know if thats true or not
     
  4. spike589715

    spike589715 Busy Member

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    a crono is quite cheap
    most guns are quite easy to adjust though some have anti tamper fitted ...
    cheers
    si
     
  5. BiggaJ

    BiggaJ Donator

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    What gun do you have (or have I missed it?).

    An RFD is a good start, you could always talk to XTX or Carl at Airtech, I have his number send me a PM if interested.

    Both come highly recommended and will work out better and more cost effective than dealing through a shop I feel. Carl is a registered firearms dealer as he makes his own PCP' s.
     
  6. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    I would get a combro mate,

    If you're able to adjust the rifle yourself, you can do so to the weight of the preferred pellet,

    mine loves jsb exact express, no I set the power in the low too mid 11's:)
     
  7. jjmac

    jjmac Active Member

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    cheers for the replies. i'll take it to my local shop this weekend and get it tested, then take it from there, at least i know its a simple fix if thats the problem.

    and biggaJ, its a walther rm8 .177
     
  8. Meteor62

    Meteor62 Major Poster

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    Keep us updated
     
  9. BiggaJ

    BiggaJ Donator

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    Thanks .... the reason I ask is because some guns have been reported as being under powered despite OEM claims, I think the RM8 is one that some guys have complained about. Nice gun though.
     
  10. Kevin49

    Kevin49 Well-Known Member

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    Hi,
    Since its a 177 PCP I wonder what pellets you are using? My daystate varies from 9 to 11.7 Ft/lbs using pellets from 5.5 gn to 15 gn. I recently tested the H&N sniper magnum (15 gn ) to check if it sent it over the legal limit but was happy to see a max of 11.7 ft/lbs. My rifle does 11.4 with the Bisley Magnum 10.6 gn and I would reccomend you try these. As mentioned above the Combo Mk4 chrono only costs £49 and easly slips onto the end of the barrel to check your power.
     
  11. jjmac

    jjmac Active Member

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    at the minute I've only tried a few different pellets but on target shooting i found the webley accupells to give me the best grouping, they're 8.6 gn, i will try a few heavier ones and see if i can find some that still give me the amazing accuracy the accupells do!

    i'll have it chronoed this week and keep you updated as I've heard a few people complain about underpowered rm8's!
     
  12. darklord

    darklord Can’t beat a tx200 at 30m

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    Are you sure the pellets aren't going straight through being a 167at those ranges its v possible.
     
  13. JSB888

    JSB888 Keyboard Hero

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    I've always found Magnums a little too hard for sub 12, and also tend to go straight through. Try JSB / AA Field, I've always found the deform well on impact and transfer a lot of energy. Even if they do go through, they tend to leave a larger than average exit hole and I haven't had a head shot bunny run from me yet.
     
  14. gasman

    gasman Up a bit,,,,,,,

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    so 1400 ftlb is abit overkill then Andy, dam it :( I thought I'd shot a bunnie the other day and I couldn't find it afterwards :)
     
  15. JSB888

    JSB888 Keyboard Hero

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    Did you hear a 'pop'? ;)
     
  16. besageezer

    besageezer Well-Known Member

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    No one seems to offer RM8 tuning probably because of the anti tamper devices which consist of steel balls pressed into a socket above the adjust screws. If someone can find a way around these then I suspect adjusting the power is by the secure screws. I have a 177 purchased in December, it was not until some time later that I found it only produced a maximum 10.6 ftlbs recorded with JSB 4.53's. Sadly Walther nor Armex reply to my e mails so you can assume they don't want to know. I'm still looking for a way around the anti tamper as the power level is well below the level advertised at 16joules, at 11.6 it wold be a superb field target gun.
    I agree it a nice gun and very accurate but Customer Care with the Manufacturer and Importer is something akin to rhyming with hit.
    What has impressed me recently is a old Logun Solo which is as accurate as the Walther, much lighter and has a fair amount of shots per fill. Presently considering chopping the RM8 in for a FX then I can stick two fingers up to people just interested in Sales with no after service.
     
  17. Tatts

    Tatts Posting Addict

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    Lol at the post above. Shooting up to 50 yards you won't see any difference between 10.6 and 11.6 so I really wouldn't worry about it. If it was below 10 with all pellets then maybe I would.
     
  18. terry1001

    terry1001 Major Poster

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    If you bought the rifle new then you should be talking to the shop/dealer who sold it to you. If you believe it to be below the standard you would expect then you should take it back and ask them to deal with the issue. Depending on the length of time you've had it you could ask for it to be exchanged or repaired or a refund. If you bought it used from a private individual you're basically on your own.
    I have no experience of the A/T fitted to these but the factory must be able to remove it so clearly it's possible.
     

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