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Reloading for G21sf

Discussion in 'Reloading' started by Tombo 65, Oct 15, 2011.

  1. Tombo 65

    Tombo 65

    294
    2
    Jun 3, 2011
    Vermont
    My brother gave me a brand new G21sf for my birthday, and I loaded up some 225gr hardcast truncated cone bullets and some 255gr hardcast lswc bullets. 225gr loads ranged from 5.5gr to 5.8gr of Unique. 255gr loads ranged from 4.9 to 5.2 gr of Unique. I ran 100 rounds of 230gr ball ammo (American Eagle and Sellier & Bellot) thru the 21 to begin with, and the accuracy was so-so.

    I settled on 5.7gr of Unique as the best load for the 225gr bullets. Accuracy was much better with this load than with the ball ammo. The optimum load accuracy wise for the 255gr bullets was 5.0gr of Unique. These were significantly more accurate than anything else I put thru the gun. I believe the velocity is between 750 and 775 fps based on the reloading info I researched.

    I am loading these Double Tap 255gr lswc 21 bh bullets in both 45acp and 45gap for my 21sf and 37 respectively. They are consistently way more accurate than any jacketed bullet I have put thru either. POA is closer to POI, and the groups are much much tighter.

    The Double Tap bullets are .452 and the typical jacketed bullet is .451 - could this be the reason for the increased accuracy with the lead bullets: a tighter fit in the barrel? I am using a stock Glock barrel in both the 37 and the 21sf. I get zero leading with the 255gr and the 225gr lead bullets.

    I assume the tighter groups are due to one or more of the following possibilities: -a better fit in the barrel/rifling
    -a more stable longer bullet
    -the twist rate in the these two Glocks is being better suited to heavier bullets

    The standard propaganda on line is that lead bullets don't work as well with Glock rifling, they barrels lead badly, and the 45acp is optimized at 230gr while the 45gap is somewhere around 185 to 200 at best. I need to try some light bullets in both guns to see how they compare to the heavy ones. The heavy ones are certainly beating the mid-range and recommended weight bullets in my guns.

    Has anyone else experienced similar results to what I am experiencing.

    Thanks
    Tombo 65
     
  2. Colorado4Wheel

    Colorado4Wheel

    14,937
    166
    Nov 2, 2006
    CO

  3. Tombo 65

    Tombo 65

    294
    2
    Jun 3, 2011
    Vermont
    What does that mean? You lost me on that one.

    What I was getting at in the original post is that I have not had great luck with jacketed bullets, and very good luck with lead. I didn't think it was supposed to work that way with the Glock polygonal rifling. I had heard somewhere that lead didn't grip Glock rifling very well, kind of like lead didn't agree with Marlin Micro-groove rifling.

    Since the .452 bullets seem to work so much better, can I go to a .452 diam. jacket bullet to get better accuracy from a Glock, or will this increase the pressure to much? I've tried this sort of thing in revolvers, but none of them had polygonal rifling (if that's the right term), so I could use some advice. The question doesn't necessarily pertain to 45acp/gap loadings. If I'm loading for 40s&w or 357sig, is a larger diam. lead bullet going to out perform a smaller diam. jacketed bullet within the velocity range that is safe for a lead bullet?

    I could sum it all up this way: I've heard so much advice from "Glock experts" over the years that I don't know what is accurate and what is urban myth (for lack of a better term). That's one of the reasons I like this forum, I can ask questions and share my experiences and get valuable feedback and advice. The info here is better than the stuff offered at the local gun store, or Dick's Sporting Goods, where nobody has ever reloaded center fire cartridges but claim to know so much about the process.
     
  4. Colorado4Wheel

    Colorado4Wheel

    14,937
    166
    Nov 2, 2006
    CO
    Your about to get a Friend Request from Wisky. Mostly for not being afraid to shoot lead bullets out of a stock Glock barrel.
     
  5. kilroy2721

    kilroy2721

    742
    6
    Feb 14, 2002
    Florida
    I have been using 230gr moly coated bullets out of my Glock 21sf without any problems. They are .452
     
  6. Zombie Steve

    Zombie Steve Decap Pin Killa

    18,083
    18
    May 31, 2007
    Old Colorado City
    Well, I tried my 225 TC cast boolits out of my G30 last week. They work great out of both of my 1911's. 50 rounds leaded the hell out of the G30. Sounds like the op is having better luck than me.
     
  7. kilroy2721

    kilroy2721

    742
    6
    Feb 14, 2002
    Florida
    Before I sharted to shoot those moly coated bullets I made sure my barrel was clean and then took the barrel apart after shooting every 2 magazines. Once I determined that I wouldn't have a problem I stopped worrying about it.

    There is very little residue in the barrel after shooting those Moly coated bullets.

    I do clean my barrel after every 250-300 rds and yes I know that Glocks don't like having lead shot through their barrels.
     
  8. dbarry

    dbarry Silver Member

    1,175
    131
    Feb 15, 2010
    the Buckeye state
    I'm shooting 180gr .452 lead with my G37 factory barrel. No leading, no problems.
     
  9. Zombie Steve

    Zombie Steve Decap Pin Killa

    18,083
    18
    May 31, 2007
    Old Colorado City
    I hate sharting moly.
     
  10. tahco gunworks

    tahco gunworks

    380
    0
    May 23, 2010
    I've shot thousands and thousands of lead out of my glocks, no problems with leading at all. I don't push them to the max, and I use the correct hardness and tumble lube as well.

    Another internet myth bites the dust.
     
  11. JBnTX

    JBnTX Texas

    19,749
    3,828
    Aug 28, 2008
    Texas

    +1 :thumbsup:

    I've shot lead out of a Glock 21 and Glock 17 since the early 1990's with no
    problems.

    Stay with mid range loads and clean the barrel thoroughly after each shooting
    session and you'll be fine.
     
  12. dla

    dla

    411
    1
    Oct 19, 2002
    Hillsboro, Oregon
    +2 :thumbsup:

    I run the loads pretty warm and don't clean the barrels. No problems.
     
    Last edited: Oct 18, 2011
  13. dbarry

    dbarry Silver Member

    1,175
    131
    Feb 15, 2010
    the Buckeye state
  14. I didn't get very good accuracy with lead in my 21SF either. Never leaded the stock barrel though, shone like a mirror with a pass of a mop.