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DonnyY moderators..Do you still need to size up?

Forums Cameras and Recording Equip DonnyY moderators..Do you still need to size up?

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    Blackpaw
    Participant
    Member
    United States
    Accuracy: +26

    Today I decided to sell the 177 CZ 400 mm barrel kit for my RTI Prophet Performance Compact (the latest one Francisco had). I’ll just concentrate on the 22 cal for now. So I need a more compact moderator than my Sumo. I’m thinking Tatsiana, but not sure what if you still need to size up, ie 22 cal gun and 25 cal moderator. I hear mixed on that now. 
     

    thanks ahead of time for advice. 

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    rsfrid
    Participant
    Member
    United States
    Accuracy: +4

    I do for all mine. Not sure it's necessary tho. The idea is it helps prevent baffle strikes. I do for my powder burner silencers as well for same reason.

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    Blackpaw
    Participant
    Member
    United States
    Accuracy: +26

    Yeah I’ve heard both so and don’t. I thought Steve on Aeac said Donny designed them so you don’t now. 

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    douger
    Participant
    Member
    United States
    Accuracy: +64

    if the barrels are centered and silencer is made correctly id sure use a 22 for a 22 sound and dirty air makes accuracy differences  just my opinion 

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    ram2jeep
    Participant
    Member
    United States
    Accuracy: +11

    I would check with Donny; they are super receptive to questions and quick with answers. 

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    CyberDyneSystems
    Participant
    Member
    United States
    Accuracy: +12

    My experience is limited to two examples, but I am literally right now dealing with DonnyFL customer service re: a SUMO that was purchase for a .25, (rated for .22 and .25) but before I received it, I tried it on three separate .22 and it's not working. I understand now that it's due to baffle collision, but I did not understand what was going on when I decided to try it on other rifles.

     

    Anyway, point being, in one case, even with it being "one size up" for .25, it failed at .22

    On the other hand, my .22 rated Tanto is working fine on the same .22 rifle I first tried the SUMO on.

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    DutchMike
    Participant
    Member
    Netherlands
    Accuracy: +8

    It depends… mostly on your setup: if you have a shroud, and then an adapter, and then mount the moderator, chances increases you get clipping. To prevent many customers complaining (as far as I can remember) Donny decided to advise to go one size up: less risk that way.

    But smallest diameter hole also helps with reducing sound. So if you setup is straight, and for example you attach the mod directly onto straightcut barrel, then I always get the smallest diameter.

    oyeah, if availble, you might try the Weihrauch xl…

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    pnwairgunner
    Participant
    Member
    United States
    Accuracy: +11

    The last couple Tanto moderators I’ve bought in .22-.25 definitely have a larger bore size than my old one. They are now oversized for the .25 and is quite a bit less effective on a .22 than my old one.  I wish the option were still there to buy the old sizes but I understand they are trying to minimize returns due to misalignment on questionable quality manufacturing from airgun makers. 
      Since the bore size change I would recommend NOT sizing up, and sticking with what Donny has designated for each caliber.  He has already done the over sizing for you at this point. 

      

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    Blackpaw
    Participant
    Member
    United States
    Accuracy: +26

    Okay, it looks like I will be safe with the .22/25 Tatsu for my 22 barrel.  Might be a couple of more weeks for the 22 barrel, but gives time to sell the other stuff.

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    Deleted Account
    Accuracy: +0

    I've never had a baffle strike with any of mine with the same caliber moderator. The question is stable is the projectile when it leaves the support of the rifling? Slugs/pellets can act like arrows until they settle down and stabilize.

    A simple test would be to shoot point blank a piece of cardboard and look for any sign of keyholing. Otherwise, something would have to be loose and out of alignment for a strike.

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    pnwairgunner
    Participant
    Member
    United States
    Accuracy: +11

    youngbuck3006

    I've never had a baffle strike with any of mine with the same caliber moderator. The question is stable is the projectile when it leaves the support of the rifling? Slugs/pellets can act like arrows until they settle down and stabilize.

    A simple test would be to shoot point blank a piece of cardboard and look for any sign of keyholing. Otherwise, something would have to be loose and out of alignment for a strike.

    I haven’t had issues with baffle strikes either but with shrouded guns where the moderator is threaded onto the shroud 5 or more inches away from the actual muzzle of the air rifle it increases the chance for manufacturing tolerances to be off enough to cause a misalignment. If a moderator is threaded directly to the barrel it has a much better chance of alignment and even then many Airgun barrels do not have bores that are perfectly centered in the barrel. Like you I’ve been lucky to not have any with any drastic misalignment issues but I imagine a person new to the airgunning world wouldn’t immediately realize the problem wasn’t the moderator but instead the shroud is askew…and this would result in the guy that sells the moderators getting returns for “defective” units when they weren’t defective at all.  Thus the moderator bore sizes continue to increase. The inner bore size on the new fatboy is very big. 
      Edit***  I did damage a .22 sumo once. I had swapped out my .22 full length barrel on my condor for the SS .25 barrel and completely forgot about it. I fired a 52 gr .25 boat tail through it and it never made it through the sumo.  

     

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