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Thread: What am I doing wrong? 12 gauge crimp - Picture

  1. #1
    Boolit Buddy

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    What am I doing wrong? 12 gauge crimp - Picture

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    I am very new to the shot shell scene. I'm working off an old MEC Jr. and loading 00 buckshot. I also added the newer Spindex pre crimp, which helped slightly. When I load using Win AA's, I am having moderate success. With Federal Gold Medal, I get swirls every time! I've adjusted my pre crimp, I've tried adjusting the final crimp. Its the same every time. Any help at all would be appreciated.

    Sorry for the rotated picture.

  2. #2
    Boolit Master
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    Those swirls won’t hurt a thing. Most crimp problems are a result of the total stack height of powder, wad, and shot either being too high or too low. It’s usually the wad. Have you looked up the recommended components to be used in the Lyman Shotshell Reloading Manual? It’s the “bible” for reloading shotshells. It lists every case to use with what wad and what powder to avoid things like this and keep the pressure safe.

  3. #3
    Boolit Bub


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    With Mec machines and Dillon machines you have to set the crimp depth and pre crimp for one specific hull. If you alter the hull and do not change settings on crimp dies, they will be at the inncorrect depth. Download the manual for your machine ( mine are mec sizemaster 12 ga and Dillon SL 900 12ga). There will be a section on setup of dies and it will explain exactly what your looking for. The swirl is normally caused by final crimp being too deep if I remember correctly. Pre- crimp should close it about 50-60% and final crimp is adjusted little by little down, until it is completely closed.
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  4. #4
    Boolit Bub


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    https://www.mecoutdoors.com/owners-manuals-sr

    Also I highly recomend lymans book on shotshell reloading. It features mec machines.

    https://www.midwayusa.com/product/101316692

    Good luck! 12ga reloading is a BLAST! The best hulls for reloading are the red AA hulls. NOT THE SILVER SUPERSPORT hulls, they are different and need different settings on your machine.

    https://www.gunbroker.com/item/902206513
    Always do sober what you said you'd do drunk, that will teach you to keep your mouth shut!"
    - Earnest Hemmingway

    " I'd rather be lucky than good, GET SOME!" Mr. Revolver" - Jerry Miculek

  5. #5
    Boolit Bub


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    The swirls wont hurt, but they will wear out your hulls faster. I generally reload em about 10-12 times before I toss em.
    Always do sober what you said you'd do drunk, that will teach you to keep your mouth shut!"
    - Earnest Hemmingway

    " I'd rather be lucky than good, GET SOME!" Mr. Revolver" - Jerry Miculek

  6. #6
    Boolit Buddy

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    The only manual I have is the Buckshot manual from Ballistic Products. It's somewhat useless to me as it only lists specific powders and only Rio and Cheddite type hulls. The Lyman manual was sold out anywhere with a reasonable price, at least when I looked last.

  7. #7
    Boolit Master
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    i dont know how many you want to reload, if this is just a few, dont worry
    if you want to do 1000s
    then go to BPI products and get the their super crimp about $35 or so but it will clear up many problems

  8. #8
    Boolit Master
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    Even when loading all the same type of hulls you will have some with swirls and some with holes. Seems every batch is a little different. Ones with holes, I stuff with paper towel.
    The only amendment the Democrats support is the 5th.

  9. #9
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    One with holes a drop of candle wax. Swirls are because you need more height in the wad colume. With buck shot the larger pellets either under or over fill the shotcup. The way to fix that is to add card wad(s)under the shot. You can make them out of those magazine inserts that fall in your lap when you get a magazine and they don't need to be fancy just rough fit the bottom of the shot cup. You can also put them on the top of the shot. You want the top of shot to be just even with the fold so when you crimp you compress the shot column a little.
    Steve,

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  10. #10
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    Hanzy4200
    Your cam is out of adjustment. The cam is what is causing the problem on your crimp.
    Google "MEC 600 Instructions". Section 5 covers the swirl issue..
    Hope that helps. You might want to download it for future reference.

  11. #11
    Boolit Master

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    ^^^^^
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  12. #12
    Boolit Master 243winxb's Avatar
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    . The die body is going to low. This puts a taper on the side wall of the case. The taper on factory shells, help auto loader shotguns feed better.

  13. #13
    Boolit Buddy

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    Quote Originally Posted by MOA View Post
    Hanzy4200
    Your cam is out of adjustment. The cam is what is causing the problem on your crimp.
    Google "MEC 600 Instructions". Section 5 covers the swirl issue..
    Hope that helps. You might want to download it for future reference.
    Thanks MAO

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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