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So I am Making this Measuring DooDad!

Discussion in 'GUNSMITHING & FIREARMS' started by USMCDOC, Jul 4, 2017.

  1. USMCDOC

    USMCDOC United States Active Member Active Member

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    It is used to measure the rim thickness of 22LR cases.. i am not done with it yet, but i am getting closer.. still have a lot of bling yet still to put into it!

    20170704_140429.jpg
     
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  2. chips&more

    chips&more United States Active User Active Member

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    Looookin good! So the casing goes into a block of steel with a hole in it sized to catch the rim from the underside? Then you compare/measure the top? Correct?
     
  3. Ulma Doctor

    Ulma Doctor Infinitely Curious Active Member

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    pardon my ignorance, but why would you need to measure the rim thickness on .22 shells?o_O
    can the thickness be adjusted ? or is merely to know how thick they are in comparison to each other?
    i'm assuming it will have effect on headspace, but as i said i'm trying to wrap my head around measuring .22 shells...
    i'm further assuming that serious deviations would create ballistic variables downrange?
    help!:blowup::grin big:
     
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  4. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    I think perhaps he is trying to achieve consistency by sorting and grouping his ammo by the various variables in the quest of better accuracy. Case I.D., cartridge OAL, case diameter, and perhaps other things could also be sorted on. If it makes a difference, it can be the difference between winning and losing when match shooting. If I did that, it would only take away my alibi, because most any gun is more accurate than me...
     
  5. Silverbullet

    Silverbullet Active Member Active Member

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    Not sure but if the rim is thin it will not ignite correctly. The primer is poured into the case as it rotates then it's dried before the powder is dropped and bullet seated , most are lightly crimped . By cking the rim you can almost find the ones who will miss fire. Anybody that's shot rimfries has had ones that don't go off . Sometimes turning and fired again they will go off. Not every time but sometimes .
     
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  6. FLguy

    FLguy H-M Supporter - Premium Content H-M Supporter-Premium

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    I used to shoot over 1500 a week. Ya, that's a lot but for someone to make their own ammo it is like Bob says, Consistency. Each slug I pourred is carefully weighed, powder masured to very high fine weights, even primers can be weighed. Cases are supper cleaned and inspected for flash hole dia. concistence. So for match shooting that UMCdoc is most likely doing, it is the difference of a win or 2nd place.
     
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  7. Ulma Doctor

    Ulma Doctor Infinitely Curious Active Member

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    it's funny, i have shot over 10,000 .22 rounds in my life- i never had one not go bang when i pulled the trigger

    centerfire ammunition, well that's another case completely
    i had some persian headstamp 7.5 French that was scary to shoot. 3 out of 4 would shoot. the 4 th one wouldn't.
    i had one of the persian shells detonate a full 2 seconds after the trigger was pulled, luckily i still had the round chambered and aimed downrange.:eek:
     
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  8. higgite

    higgite General Manger - Proofreading Dept. Active Member

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    Whether it's beneficial or not may be debatable, and probably should be debated on a different forum, but I think it's a pretty cool piece of work. I'm considering something similar but for different measurements of reloaded centerfire cartridges. I hope mine turns out as well as USMCDoc's.

    Tom
     
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  9. USMCDOC

    USMCDOC United States Active Member Active Member

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    i agree that the debate of the effects should be somewhere else.. but i will state that the argument is that sorting by rim thickness of 22lr shells does not improve or make you ammo "more" accurate.. i agree with that statement.. but sorting by rim thickness has in the past proven to me that it makes those "flyers" more consitant.. meaning.. lets say that cases that are minus 2 in deviation from the "0" case (which is the one that you zero the gauge to) are flyers that land at 10 o'clock in a no wind condition. Would you want to have them just randomly land there or have them all concentrated together so that they all land there consistently, just center up on the target.. that is the jist to sorting.. it does seem to help with lower level match ammo.. but say Lapua Center X or Black or Red box Eley.. it don't seem to help too much with that ammo.. but i know a guy that is weighing his Center X ammo.. and doing good with it..

    i used to be a center fire competitor.. long range, Palma and the sort. And sorting does make a difference.. i would be interested in what your deciding to do.. maybe i can help..
     
  10. USMCDOC

    USMCDOC United States Active Member Active Member

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    It is said that there is with certain 22lr chambers that there is a "rim" thickness that the rifle will like better than the others.. so the quest is to find that.. it is said that .041 headspacing is the best.. The ammo i was checking all was running around .031 in thickness.. i need to check some Lapua Center X, my rifle seems to like that stuff!
     
    Last edited: Jul 4, 2017
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  11. BGHansen

    BGHansen United States H-M Supporter - Premium Content H-M Supporter-Premium

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    So I'm guessing if you get a thick one you just hit the end with a hammer to thin it out (LOL)? Makes sense what you're doing, have a buddy with a Ruger 10-22 that doesn't like certain ammo, no jams with others.

    Bruce
     
  12. USMCDOC

    USMCDOC United States Active Member Active Member

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    Bruce you're Almighty! Well, my name ain't Maxwell.. so i will leave the "hammer" out of it.. but the firing pin is a different matter all together!
     
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  13. Hozzie

    Hozzie United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Not to get into a big debate, but competition shooters use a headspace of .043 for 22's. Lapua has a bit thicker rim than Eley, but everyone uses .044 for both.

    Lead angle and chamber specs are the big debate now. I don't know any competition guys that sort ammo on rim thickness anymore.

    Ymmv.

    Edit: Actually I had a brain fart as well, it is .043 everyone is using.
     
    Last edited: Jul 5, 2017
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  14. USMCDOC

    USMCDOC United States Active Member Active Member

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    Thanks, i knew i was in the general area with the number, i was pulling one out of the air, just for the sense of explanation of what was going on.. really not trying to debate or start one.. but i am glad that you chimed in heretofore!

     
  15. USMCDOC

    USMCDOC United States Active Member Active Member

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    yeah.. i know.. from what i understand, it is more about the chamber now, since guys have gotten more into matching that to the ammo and where the lead scribes the driving band of the bullet.. like the barrel i have that i am fixing to put on a Rem action i have.. it is a "long" Eley chamber that scribes on the second band. It is a HS Precision 10X barrel that was chambered by Karl Kenyon.
     
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  16. Hozzie

    Hozzie United States H-M Supporter - Premium Content H-M Supporter-Premium

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    I was apparently not thinking last night either. Headspace is set at .043 with a no go at .045 or 046 normally. Just wanted to clarify in case anyone is really paying attention. Sorry about that.
     
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  17. USMCDOC

    USMCDOC United States Active Member Active Member

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    All good!
     
  18. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    I think we need to change the title and move to Gunsmithing & Firearm forum.:D:cautious:
     
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  19. USMCDOC

    USMCDOC United States Active Member Active Member

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    Do it, i didn't realize there was one.. I don't know about the title change.. but yeah..
     
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