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Reloading the 9mm

Discussion in 'Reloading' started by Zombie556, Mar 8, 2017.

  1. Zombie556

    Zombie556

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    I know I'm beating a dead horse here. I started reloading a Glock 22 gen 4 with a conversion barrel to 9mm. I did a pressure work up, starting at 4.5 grains to 6.0 grains of Power pistol.
    124gr FMJs, 1.150 COAL and 5.3gr is showing pressure signs (Cratering) on Winchester small pistol. The recoil is low and the functionality is great. The primers are not flat just starting to crater in the square pattern that glocks have around the square firing pin. normally I can go past the books power charge weights before I see pressure signs,
    Question- WSP primers...... do they show pressure signs earlier? I'm new to pistol reloading more accustom to Rifle.

    Thanks for any advise
     
    Last edited: Mar 8, 2017
  2. fredj338

    fredj338

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    Last edited: Mar 9, 2017
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  3. dudel

    dudel

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    Pictures? I'll agree with Fred, that is sounds normal.
     
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  4. nitesite10mm

    nitesite10mm Proud Husband

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    There is cratering and there is slight primer flow. I bet you are experiencing the latter, and a GLOCK is just designed in a way that it is normal.
     
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  5. nitesite10mm

    nitesite10mm Proud Husband

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    Winchesters are not especially hard nor have thicker cups.
     
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  6. Terlingueno

    Terlingueno

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    My 9mm load is mixed, who knows how many times fired brass, Wolf/Tulammo/Remington/S&B/Winchester/Fiocchi small pistol primers, 6.0 grains of Power Pistol under a 125gr Montana Gold hollow point at 1.115 COL and they run 1140-1150 in a G19 using a Lab-Radar chrono. All on a Dillon 550. No issues whatsoever.
     
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  7. Zombie556

    Zombie556

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    Thanks guys! I'm trying to upload a pic but can't figure out how.
     
  8. Zombie556

    Zombie556

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    [​IMG]
    Here is a pic.....
     
  9. willie_pete

    willie_pete NRA Life Member

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    Careful, looking at primers is not a foolproof way to measure pressures. Case head expansion is probably more reliable.

    wp
     
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  10. willie_pete

    willie_pete NRA Life Member

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    Still not there for me.
     
  11. Zombie556

    Zombie556

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    I'm still learning about case head measurements for reloading. I understand the process but as with all reloading I can't find any sources that give a "stop at this point" answer. I will shoot some quality ammo through the gun and measure those tomorrow. Thanks!!
     
  12. Taterhead

    Taterhead Counting Beans

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    The problem with "reading primers" is the fact that primers are used for a variety of cartridges with widely different pressure assignments. There is no way a primer will know that it's suppose to go flat or crater for a 38 spl load at 21k psi (beyond +p pressure for this round) but show "normal" pressure signs for a 357 sig at 39.5k psi.

    If you can get a copy of Ken Waters Pet Loads, he explains how he used case head expansion for decades for his load development. Even if one doesn't get the book for this purpose, it is a dang good read.
     
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  13. willie_pete

    willie_pete NRA Life Member

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    I use something close to this; haven't blown up a gun yet.

    http://shootersnotes.com/articles/when-are-pressures-too-high/

    wp
     
  14. fredj338

    fredj338

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    Problem with measuring case head exp is the process. You need a factory round to measure as a base line & you need a good micrometer, calipers don't cut it. Acceptable CHE is less than 0.0005".
    https://www.shootingsoftware.com/ftp/dbramwell july 19 04.pdf
    YOu know things have gone way past acceptable when you get primer leaks or worse, a blown primer. Reading primers isn't useless but not definitive either.
     
  15. willie_pete

    willie_pete NRA Life Member

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    True, but I am a wussie. I stop way before primer leaks.

    wp
     
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  16. fredj338

    fredj338

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    I only mention such obvious things as a load that is fine in one brass manuf may show over pressure in another. I find Federal rifle brass particularly soft & a load that is fine in say Norma brass shows mild primer pocket enlargement in Fed. Another reason CHE can be diff to judge, fine in one case, over pressure in another.
     
  17. willie_pete

    willie_pete NRA Life Member

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    Yep, the link I posted says you have to have " before " measurements on any different headstamp you use. I just use CHE for rifles because I don't hot rod pistol rounds.

    wp
     
  18. fredj338

    fredj338

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    Yeah those 10mm nuke guys need to learn CHE.:ambulance:
     
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  19. Taterhead

    Taterhead Counting Beans

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    Fred, the true 10mm loaders know that there is no such thing as excessive pressure as long as you use 1) 800-X, 2) a KKM barrel and 3) 24# spring. [SSarcasm]

    :crazy:
     
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  20. WeeWilly

    WeeWilly

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    You are probably a full grain under max pressure for that bullet and OAL.

    If you think you are getting pressure signs at 5.3gr, make sure your scale is reading properly (i.e. check weights).