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Thread: Glock gen 5 17

  1. #1
    Boolit Bub
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    Glock gen 5 17

    I was shooting a match yesterday and had a few rounds make an oblong entry. Two rounds that I know of, possibly more. The holes were quickly pasted over so I didn't get to have a good look. I also had three consecutive misses on a steel target at 10 yards that I cannot account for.

    I slugged the bore and the groove diameter measures .355" and my bullets were sized .356" The rifling is somewhat different on the gen 5 17.

    Load is Lee 356-120-TC over 4.5 gr. Auto Comp, COAL: 1.030". Hardness is around 11. I'm getting moderate leading but nothing a copper chore boy over a brush doesn't fish out. Has anyone else had a chance to play around with the gen 5?

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  2. #2
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    dragon813gt's Avatar
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    There should be no leading at all. Size to .357 and try again.

  3. #3
    Boolit Master bosterr's Avatar
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    If you're using Lee dies, be aware they only flair the case mouth and don't expand where the rest of the boolit sits. I switched to RCBS which do expand where the bullet sits and the case sizing down the boolit went away. Generally I size as large as the plunk test allows.

  4. #4
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    W.R.Buchanan's Avatar
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    I started Powder coating all my cast boolits about 9 months ago. All leading in every gun from .40 S&W to .45-70 .44 Special/Magnum and .45 ACP magically disappeared.

    The guns are 4 gen 3 Glocks, Kimber 1911, Ruger SBH and BH, S&W696, Marlin 1894 and 1895.

    These guns vary widely in bore sizes and boolit fits. Makes little to no difference. The PC completely eliminates the lead to bore contact and thus the leading.

    It was pretty cheap to get into and the benefits are no lube to deal with which equates to no possibility of powder contamination, or inadequate lube performance, and cleaning of all of the bores on all of these guns has been reduced to one clean patch to remove the powder fouling from the last shot fired.

    Another benefit is that it increases the size of the boolits from .002-.004. So if you have moulds that are dropping undersized boolits they can be bumped up in size and then sized down to what is appropriate for your gun.

    With Glocks the boolit fit is most important, and they will lead if it is not right. Erring on the large side is best and as long as the rounds feed into the chamber freely you are good to go.

    Gen 5 Glocks have conventional rifling not the so called Polygonal rifling of the past. IE; the Lands are square cut as opposed to being rounded like previously made. This should make shooting lead boolits easier but I don't really know why, as I never had problems with any of mine.

    Randy
    "It's not how well you do what you know how to do,,,It's how well you do what you DON'T know how to do!"
    www.buchananprecisionmachine.com

  5. #5
    Boolit Buddy
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    Quote Originally Posted by bosterr View Post
    If you're using Lee dies, be aware they only flair the case mouth and don't expand where the rest of the boolit sits. I switched to RCBS which do expand where the bullet sits and the case sizing down the boolit went away. Generally I size as large as the plunk test allows.
    If you want to keep using Lee dies to load with (if that is in fact what you're using) you can swap out the 9mm expander plug in the expander die with one for a 38 S&W. You can order just the plug from the Lee website for really cheap. It'll expand down into the case further than the stock plug, and also just a touch bigger so there's no chance of swaging down your boolits when you seat.

    This one fix solved pretty much all of my leading problems with 9mm

  6. #6
    Boolit Bub
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    I'm using RCBS with a Dillon powder through belling die but thanks.

  7. #7
    Boolit Buddy retrobass's Avatar
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    I've got several loads sitting on my reloading table, ready to test out in my new Gen5 17. I hope my Lee 120 TC powder coated bullet will shoot in it; it shot horribly in my gen 3 but perfectly through my KKM.

    One interesting detail I ran into, make sure you do a plunk test when setting up your load for a gen 5. My COAL had to be 35 to 40 thousandths shorter than my OEM Gen 3 or KKM barrel. If you assumed that your normal OAL would work (a safe assumption between older models in my experience), that could account for the erratic issues.

    I have high hopes for the Gen 5; I bought it to shoot cast and remain GSSF legal.

  8. #8
    Boolit Master historicfirearms's Avatar
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    Quote Originally Posted by bosterr View Post
    If you're using Lee dies, be aware they only flair the case mouth and don't expand where the rest of the boolit sits. I switched to RCBS which do expand where the bullet sits and the case sizing down the boolit went away. Generally I size as large as the plunk test allows.
    That's not true. I just measured my Lee 9mm expander yesterday. The bullet seating part of the expander measured .354. If you are talking about the Lee universal expander, then I agree that only flares the case mouth.
    I was a dog on a short chain
    and now there’s no chain.
    Jim Harrison 1937 -2016

  9. #9
    Boolit Master
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    What is different about the rifling? I hope they don't screw up a good thing. I love, love, love my Glock M20 Gen4 10MM.
    We Know Mass Cannot Be Weighed But It Has Newtonian Weight And That Is Derived From Kilograms And Kilograms Can Be Converted to Pounds. But, Still Mass Cannot Be Weighed. But How is the kilograms obtained? Can Kilograms Be Weighed? Evidentally Yes It Can. But, Still Mass Cannot Be Weighed So Kilograms Must Not Exist. Funny Isn't It.
    One good thing out of this the next time I'm at the doctors and they want to weigh me I'll tell them mass cannot be weighed.

  10. #10
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    EMC45's Avatar
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    I've shot that Lee bullet out of a few different Glock 9MM pistols. I had the same problem. Mine were keyholes and bouncing back off backstop due to tumble and yaw in flight. I was sizing at .356. I bumped up the diameter to .358 and it all went away and they were very accurate from that point on.
    You can miss fast & you can miss a lot, but only hits count.

  11. #11
    Boolit Buddy retrobass's Avatar
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    Just tested a few loads through my new Gen 5. All loads were:
    Lee 120 TC, softish alloy, weighing 124 gr each. PC with Smoke's Clear, sized .357
    COAL was a cartoonishly short 1.043"
    Crimp 3.80
    Blazer Brass, Federal SPP

    Average velocities were:

    3.8gr Sport Pistol 1082

    4.0 Sport Pistol 1093

    4.0 N320 1101

    The 4.0 SP acted like it really wanted to group at 25 yards. I think a long day of work, plastic sights, and a heavy trigger could have all contributed to some fliers on my part. The good news is, almost no leading! It's not going to be as user friendly as my old KKM barrel, but I'm hopeful she can be made to shoot lead accurately with a little tinkering.

    4.2 Sport Pistol over 124 Delta Precisions yielded a 3" 10 shot group offhand at 25 yards; I suspect the gun is mechanically capable of much tighter.

  12. #12
    Boolit Buddy retrobass's Avatar
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    Quote Originally Posted by blue32 View Post
    I'm using RCBS with a Dillon powder through belling die but thanks.
    You can get a Dillon powder through custom made to Lyman M die specs. In my limited experience, searinf our bullets this deep in a 9 is bad mojo if the case is just belled and not properly expanded.

  13. #13
    Boolit Bub
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    I cast some more bullets but they barely mic at .358. I'll try it again this weekend.

  14. #14
    Boolit Master FergusonTO35's Avatar
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    Try seating to 1.055. You might be pushing it so far down in the case that the bottom of the boolit is getting pinched.
    Currently casting and loading: .32 Auto, .380 Auto, .38 Special, 9X19, .357 Magnum, .257 Roberts, .30 WCF, .45-70 Gov't.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check