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when to stop pushing the envelope?

Discussion in '10mm Reloading Forum' started by gofastman, Apr 1, 2012.

  1. gofastman

    gofastman

    496
    0
    Jan 29, 2010
    MN
    now that I no longer have a glock oem barrel and dont get glock smiles, what do you look for to determine if you have ventured too far into over-pressure territory?

    My storm lake 10mm barrel has good chamber support and my LWD 10-40 conversion barrel as REALLY good chamber support (old design I guess :upeyes:)

    Obviously it is prudent to never venture too far outside published load data. but those of you that are like me and like to "test" things, example; KEGS and 21Carrier with their ridiculous 135gr loadings.
    what do you look for to make sure your loads are reasonably safe?
     
    Last edited: Apr 1, 2012
  2. - gas leakage at primers
    - flattening primers
    - primers fall out

    I got IGB 4.6" full supported barrel so no smilies ever and it's chamber is tighter than OEM so all what's left are primers. Beside that I have final goals: 200gr XTP/1250, 155gr GD&XTP 1500, 165gr GD/1400 and recently (still working on it) 212gr hardcast/1200. No need to go higher.
    When developing loads, kevlar gloves and Revision googles are must.
    This week I am gonna get police riot helmet as well - older model, not issued anymore. Nice to have friends in LE :cool:
     


  3. Javelin

    Javelin Got Glock? Silver Member

    13,775
    3
    Feb 9, 2008
    N. Dallas
    Keep going until you post a pictorial message on GT without any explanation about a blown G20 and then we can all throw feces at you, Glock, and the 10mm and then get into a pissing match over who is at fault.






    April fools... :wavey:
     
  4. gofastman

    gofastman

    496
    0
    Jan 29, 2010
    MN
    I need some better gloves, I use some thing goatskin ones right now

    I wear, and recommend to others, Uvex Genesis XC they meet MIL-V0 ballistic requirements, meaning they can withstand an impact that has 7 times more energy than standard high impact (ANSI Z87+) safety glasses.
    They also have an anti-fog coating that actually works!
     
    Last edited: Apr 2, 2012
  5. Any Cal.

    Any Cal.

    442
    0
    Oct 27, 2008
    I am thinking that I want to limit my loads to those that start to smile in the factory barrel. That way if the loads ever get mixed up, it isn't as likely to be dangerous, and it keeps me from raising pressures too high chasing power.
     
  6. Gloves don't cost much comparing to hand surgery :supergrin:
    They have to be fully lined w. spectra or kevlar:
    http://www.ebay.com/itm/TACTICAL-SE...A_MWA_Gloves_Mittens&var=&hash=item43a67ff416
    or:
    http://www.ebay.com/itm/POLICE-SEAR..._Security_Fire_Protection&hash=item43a3691fdc
    or:
    http://www.ebay.com/itm/Kevlar-Line...t=LH_DefaultDomain_0&var=&hash=item27c4427d34
    etc.
     
    Last edited: Apr 3, 2012
  7. Sounds reasonable if you use both barrels, factory and aftermarket. I don't. I even don't dare to shoot my woods carry load 200gr XTP/1250fps in OEM barrel.
     
  8. gofastman

    gofastman

    496
    0
    Jan 29, 2010
    MN
    Last edited: Apr 15, 2012
  9. Kegs

    Kegs Ol 8 fingers ;)

    2,688
    2
    Oct 26, 2009
    Cold side of conus
    I wait til the primers pop in some of them and then back off.
     
  10. gofastman

    gofastman

    496
    0
    Jan 29, 2010
    MN
    Seriously?
     
  11. _The_Shadow

    _The_Shadow Ret. Fireman

    4,519
    21
    Jul 23, 2007
    Southeast, LoUiSiAna
    There are two weak spots to be concerned about...
    Case web where unsupported this could allow the casing to blow out releasing high pressure jets of gas.

    The other is lockup & recoil system. This is where the impuse overcomes the lockup/recoil system and the ejection cycle starts too soon. This allows the slide to move backwards increasing the unsupported casing web area or if the casing is held tightly to the chamber walls the space between the breech face and the cartridge head can increase and the primers can back out or blow out. Some casings can be left in the chamber and not extracted, this usually happens with powders that are too slow for semi auto rifles.

    Neither are a safe conditions...
     
  12. gofastman

    gofastman

    496
    0
    Jan 29, 2010
    MN
    I have a comp'd SL barrel, good chamber support; and an 'old style' .40 LWD conversion with very good chamber support.
    I usually run a 24lb Wolff spring and step down to an ISMI 24lb, ISMI 20lb and try to get back to the OEM spring, I find the comp works better at reducing recoil and flip with the lighter recoil springs, I don't go below the stock one though.

    If I have the brass supported, and the lockup issue under control, what is the next weak link or pressure indicator?
     
  13. _The_Shadow

    _The_Shadow Ret. Fireman

    4,519
    21
    Jul 23, 2007
    Southeast, LoUiSiAna
    The primers could flatten out completely, blow out or holes in them or case head seperation could happen but it is hard to say just what the weakest area that will show signs or let go!!! It still remains part of the lock up and timing of unlock to start the ejection cycle...
     
  14. Kegs

    Kegs Ol 8 fingers ;)

    2,688
    2
    Oct 26, 2009
    Cold side of conus
    Yep. I have found that's better than waiting until the pistol explodes. :supergrin: :wavey:
     
  15. blastfact

    blastfact

    1,657
    21
    Aug 15, 2011
    Oklahoma
    I drove my 155gn XTP's right up to the point of insanity. With both Win and Starline brass. At a very hot Blue Dot load I have gotten micro holes in the brass at 1/3 of the way up from the primer. They can be seen as little carbon spots. Under magnification I can see little tiny pits. I have put this brass in a hydraulic press. Sealed it off filled with water and put 125 psi of air to it. After about 10 mins under pressure the outside of the brass starts showing moisture where the carbon spots are.

    Head, web, primer and all of that looks great. So it must be a hot spot developing in a nano second followed by a very slight gas leak, thus the carbon spots.

    Action taken. Back down 2/10th of a gn and let the lighting flash and the thunder roll. :)
     
  16. Yondering

    Yondering

    564
    0
    Dec 3, 2011
    How fast was this, out of curiosity? Std length or 6" barrel?
     
  17. blastfact

    blastfact

    1,657
    21
    Aug 15, 2011
    Oklahoma
    Lets just call it 1650 fps @ 7 yards. The old Chrony I borrowed to work up the load. Worked about as well as my old one that I gave away.
     
  18. gofastman

    gofastman

    496
    0
    Jan 29, 2010
    MN
    Lets see if 10grs of BlueDot and a CCI 400 will do the trick in my .40 conversion barrel!
     
  19. _The_Shadow

    _The_Shadow Ret. Fireman

    4,519
    21
    Jul 23, 2007
    Southeast, LoUiSiAna
    Gofastman, are you working with a CHRNO? If not your wasiting you time! Why? Because you will have no idea of the velocity developed to learn anything useful!

    Be safe and best regards!
     
  20. Jitterbug

    Jitterbug

    870
    5
    Aug 27, 2002
    What with the cost of components my $120 chrono from Midway paid for itself in no time, without it I was always changing this or that and guessing at the velocity.

    Or guestimating from what other's where getting, now that I KNOW what the velocity is, I'm enjoying considerable savings and a specific load, tuned to my criteria, so I tend to stick with it, not to mention the peace of mind.

    I agree 100% about wasting your time, not to mention lottsa money without one.

    Great tool, that's greatly enhanced my reloading enjoyment. Get one!