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Why so much effort on 9mm sizer?

Discussion in 'Handloading and Reloading' started by MGRAY, Nov 14, 2012.

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  1. MGRAY

    MGRAY Well-Known Member

    Hi,,Been reloading 38 sp and 357 for a couple years. Just started to reload 9mm. My question is this,, Why does it take so much more effort in the resize die for the 9 then it does for 357 mag? I use a LCT and Lee die set. Thanks
  2. Lost Sheep

    Lost Sheep Well-Known Member

    Thanks for asking our advice.

    The .357 and .38 cases are cylindrical. The 9mm chamber (and new factory brass) is tapered slightly.

    Extending those facts by logic:

    When resizing 9mm with a sizing die that has the carbide ring at the mouth, you are compressing that tapered casing into a cylinder, working the lower part of the case a lot more than the upper part. It doesn't get any better once you have sized it once, either, since on each firing the case gets blown out to the chamber dimensions, which, per SAAMI specs, is tapered.

    If you had a 9mm chamber made with a cylindrical shape, you would not be able to chamber factory ammunition and would have to size new brass to fit your chamber before even the first loading. However, you would find reloading YOUR brass to be as easy as 38 special after that.

    I am told the reason for the taper is to ensure reliable, easy feeding in fully automatic and semi-automatic military and police weapons (used all over the world).

    Lost Sheep
  3. MGRAY

    MGRAY Well-Known Member

    Thanks for spelling that out for me. Makes sense now. Marty
  4. ReloaderFred

    ReloaderFred Well-Known Member

    Just lightly spray your 9x19 brass with any brand case lube and they'll go through your sizing die like greased lightning. In fact, you don't even have to spray them all, just about 20% of them and run a lubed case through the die about every 7 or 8 cases. After sizing, then tumble them in plain corn cob for about 20 minutes to remove the lube. Your arm will thank you.

    Hope this helps.

  5. ArchAngelCD

    ArchAngelCD Well-Known Member

    I also use a light coat of One Shot on my 9mm and 45 Auto brass. It makes the sizing a lot easier, really, a lot...
  6. Walkalong

    Walkalong Moderator

    Just be careful you don't throw your arm out the first time you try it when there is no resistance on the handle. ;)
  7. 918v

    918v Well-Known Member

    Spraying cases with lube will get lube inside the cases.

    Can you see a problem?
  8. joustin

    joustin Well-Known Member

    Nope, tumble after sizing to remove the lube.

    Sent from my DROID RAZR using Tapatalk 2
  9. tcj

    tcj Well-Known Member

    I use the Hornady 1-shot and do not clean after resizing...no problems with over 3,000 rounds of 9mm so far.
  10. 918v

    918v Well-Known Member

    So you are spray lubing 9mm for sizing on a single stage press? I dunno about your press, but mine has plenty of leverage to size 9mm w/o lube. Not lubing saves a lot of time.
  11. Certaindeaf

    Certaindeaf member

    All presses have plenty of leverage to size 9mm without lube. The lube makes it way easier.
    It takes about five seconds to lube a sack full and costs probably ten to fifteen cents per thousand. No removal necessary.
  12. 918v

    918v Well-Known Member

    and people complain about bullet setback and blame it on expander plugs and bad sizers, but its probably the lube that got into the case.
  13. rcmodel

    rcmodel Member in memoriam

    I use spray lube on every caliber handgun case I load.

    We are not talking about soaking them in lube, so contamination is not going to happen, whether you tumble them after or not.

    Just a light spritz in a mixing bowl full of cases and stir therm around with your hand.

    A very little goes a long way in easing sizing pressure.

  14. rbernie

    rbernie Well-Known Member

    I switched to Dillon sizer dies and found that they don't need nearly as much force to size 9mm as did my Lee and RCBS dies. Dunno why.
    Last edited: Nov 15, 2012
  15. Certaindeaf

    Certaindeaf member

    You ever finger diddle a greased lead bullet? Take that lube off there and yer good to go! not
  16. Uniquedot

    Uniquedot Well-Known Member

    When i lube nines i spray the lube on an old towel and wrap the cases up in it and give them a shake or two.
  17. beatledog7

    beatledog7 Well-Known Member

    I agree with those who add a touch of spray lube to handgun cases. After tumbling the batch of brass, put it into a plastic coffee can (no more than 2/3 full), spray in a half second-burst of One-Shot or whatever spray lube you like, put on the lid, shake lightly, repeat a couple of times.

    This adds just enough slickness to make resizing a breeze even with carbide dies. It does not contaminate powders or primers.
  18. SSN Vet

    SSN Vet Well-Known Member

    I give every tenth round a quick smear with Imperial wax....

    and as noted... I pull a LOT less hard on the next down stroke.

    after about ten rounds they get pretty stiff again.

    yeah.. the press has all the mechanical advantage needed to get the job done... but for me at least, reloading is supposed to be fun.
  19. gamestalker

    gamestalker member

    I thought all 9mm brass, old or new, has a tapered wall? I've been loading 9mm for a good 30 yrs. or so, and so far as I can tell all the brass has a tapered wall. According to my Speer #10 the 9mm was made with the tapered wall to prevent bullet set back. And as far as resistence, I don't use any lube for any handgun cartridge and it goes through the resizer just fine, and I don't have problems with set back.

  20. wanderinwalker

    wanderinwalker Well-Known Member

    I'm with SSN Vet, a little bit of Imperial Sizing wax every few cases and the 9mm reloading goes a lot smoother. Heck, I load on a progressive and don't even keep track of the few cases that get lubed. All gets loaded, bucketed and then fed through the Glocks.
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