starting to reload 40 S&W

Discussion in 'Ammunition & Reloading' started by beltor, Jan 3, 2014.

  1. beltor

    beltor New Member

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    I am new to reloading and about to start reloading 40 S&W rounds. I am trying to find out, how can you know if you are crimping the bullet too much, or not enough?
     
  2. BtDoctur

    BtDoctur Member

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    really cant "crimp " in the normal sense because the case mouth is what sets the cartridge depth and most .40 cal bullets dont have a traditional crimping groove on the bullet
     

  3. beltor

    beltor New Member

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    I am loading for my sub2000. I was able to assemble 5 dummy loads (only used the brass and a bullet) and I am able to cycle the round throw the rifle. from what I can tell the bolt closes all the way. now I think I am ready to add the primer and the powder. was going to use HP-38 powder for the rounds.
     
  4. Rick1967

    Rick1967 Well-Known Member

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    I have used hp-38 with 40s&w. It will work well.
     
  5. mseric

    mseric New Member

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    The crimp on the 40 S&W is only used to remove the flare plus maybe a thou or two more.

    It is not used to secure the bullet, neck tension does that.

    How much you ask? Measure it. It should measure between .421 and .423. I strive for .422.
     
    Last edited: Jan 4, 2014
  6. beltor

    beltor New Member

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    That helps. This is going to be me first live rounds. I am just concerned that I am doing it wrong.
     
  7. JonM

    JonM Moderator

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    i dont load for 40sw but i load a LOT of straightwall cases in 9mm 45acp 45colt 44mag. the technique is the same for all of em.

    for taper crimping:

    size a case then take your calipers and measure the outside diameter of the case mouth.

    when you set the crimp adjust the die a teeny tiny scootch at a time until the crimp is setting the case mouth to the diameter you measured after it was resized.

    setting the crimp tighter will crush the bullet and actually cause the bullet to be loose in the case.
     
  8. spottedpony

    spottedpony New Member

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    One noticable difference in the calibers mentioned above, while they are all straight sided, the 44 mag headspaces on the case rim, thus if it's overcrimped a tad, there will be no chambering/firing issues, per se, as there could be with a rimless cartridge that headspaces on the case mouth.
     
    Last edited: Jan 4, 2014
  9. beltor

    beltor New Member

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    Ok, I have 5 rounds loaded with federal small pistol primer (100 I think), Hornady 180 gn FMJ-FP, 4.2 gn of HP-38. 3 have an OCL of 1.124 and two of them hav a 1.120 will the two with the shorter OCL be ok, or do I need to pull the bullet and reset them?
     
  10. jebsca

    jebsca New Member

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    I looked in my hornady, lee, and Lyman books and did not see that bullet and powder for 40. The closest I found was 180 gr xtp over hp38 and a Minimum COL of 1.125. That makes your 1.120 too short.

    If it was me, I think I would pull the two at a minimum, and check if the gun would like something a bit longer than the minimum.

    I have never loaded 40, so take this for what it's worth, but I would check to see if your gun would close on maybe 1.130-1.135, if that will fit in the mag. It may even like longer.
     
    Last edited: Jan 7, 2014
  11. Crazycastor

    Crazycastor New Member

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    I would load ten at a time go out and shoot them. See how accurate they are and adjust from there. If they feed and shoot just fine, leave it alone. Measure a standard .40 bullet against your reload. They should be close to the same depending on what bullet your are loading. Your most likely reloading standard solid flat top bullets. If you go to a hollow point that might change a bit due to the manufacturing process of the bullet but it still should be pushed down inside the case the same leaving the round the same size.
     
  12. mseric

    mseric New Member

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    Yes, they will be fine. 4 thousands of an inch is less than the thickness of a human hair and will not affect pressures in any way.

    Hornady lists this bullet at 1.125, you are right on the money with Hornady data. Bullets will vary and OAL will vary. .004 is nothing and as good as you will get.

    That said, OAL is bullet and firearm specific, not manual specific. You need to check you loads and make sure they fit in YOUR chamber before you leave the bench.

    Take the barrel out and do this. If it looks like #4 you need to seat deeper regardless of what the manual says. The finished rounds should drop right into the barrel and fall right back out when tipped upside down.

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