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Case length question

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  • unicom

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    According to the Hornady the max case length for 300 blackout with a 208 grain bullet I’m loading is 2.250 and right now I’m at 2.260 because I used the col Hornady gives you before you look up your actual bullet you are using. So do I seat the bullet farther down or Am I good where it’s at
    3fb7dc8ca7efb6b14e3c047ac81a8916.png

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    Lonesome Dove

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    If it fits in the mag and chambers it’s good. Make a dummy round seated long and color the bullet with a sharpie. Chamber it and see when it hits the lands. Back off a bit from there.
     

    unicom

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    If it fits in the mag and chambers it’s good. Make a dummy round seated long and color the bullet with a sharpie. Chamber it and see when it hits the lands. Back off a bit from there.

    Cool thanks


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    unicom

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    Do the two bullets on the right look right
    519f61331d9db8c01a4bc8d3ac6213e1.jpg

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    Younggun

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    Looks like the case is bulged a little bit. Probably happened while crimping.




    Back off the crimp a little and I bet it goes away.


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    avvidclif

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    If the bullet doesn't have a cannelure to crimp into then adjust the die to just remove the bell from the case mouth, not crimp it. Your finger will tell you when it's right. Setting the seating/crimp dies is a 5 step procedure.
    1. Adjust the die abt 1/8" or more off the shellholder.
    2. Run the seating stem way down.
    3. Seat a bullet by feel. Seat a little and measure overall length. Continue until the length is correct or until the middle of the cannelure is at the case mouth.
    4. Back off the seating stem so the bullet is not moved and adjust the crimp die in small increments until the case mouth is straight or until it's just folded into the cannelure. You will have to back off the case slightly with the arm to make adjustments. Lock down the die while the case is in it so it doesn't move.
    5. Adjust the bullet seating stem until it contacts the nose of the bullet, firmly, not just touching and lock it.

    Try it and fine tune if needed
     

    unicom

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    If the bullet doesn't have a cannelure to crimp into then adjust the die to just remove the bell from the case mouth, not crimp it. Your finger will tell you when it's right. Setting the seating/crimp dies is a 5 step procedure.
    1. Adjust the die abt 1/8" or more off the shellholder.
    2. Run the seating stem way down.
    3. Seat a bullet by feel. Seat a little and measure overall length. Continue until the length is correct or until the middle of the cannelure is at the case mouth.
    4. Back off the seating stem so the bullet is not moved and adjust the crimp die in small increments until the case mouth is straight or until it's just folded into the cannelure. You will have to back off the case slightly with the arm to make adjustments. Lock down the die while the case is in it so it doesn't move.
    5. Adjust the bullet seating stem until it contacts the nose of the bullet, firmly, not just touching and lock it.

    Try it and fine tune if needed

    Cool thanks


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    Ozzman

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    Are you roll crimping these? Bulged cases should not occur when you are using dedicated crimping die. Roll crimp yes, but not for a crimp die.

    You might need to flare the case more ever so slightly before dropping the charge so that the bullet seats with less resistance. The roll crimp/crimp die will knock the extra flare down and save your cases. Blackout dies come with a .308 sizer and seating a long bullet can cause the tiny shoulder to deform during seating if extra care is not used.
     

    unicom

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    Since I’m loading 300 blackout for an ar15 should I be doing any kind of crimp


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    unicom

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    Are you roll crimping these? Bulged cases should not occur when you are using dedicated crimping die. Roll crimp yes, but not for a crimp die.

    You might need to flare the case more ever so slightly before dropping the charge so that the bullet seats with less resistance. The roll crimp/crimp die will knock the extra flare down and save your cases. Blackout dies come with a .308 sizer and seating a long bullet can cause the tiny shoulder to deform during seating if extra care is not used.

    I’m trying to roll crimp these so they will run in my AR. I have no issue buying just a crimping die like lees factory crimp die if I need. The RCBS die instructions say I can set the die to roll crimp.


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    Dawico

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    Since I’m loading 300 blackout for an ar15 should I be doing any kind of crimp


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    I don’t.


    YMMV.


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    This. I don't.

    If you have proper neck tension you won't need it.

    If you must though get a Lee FCD. Perfect case length isn't a concern with how the die works and they are super easy to fine tune to what level of crimp you want.
     

    Dawico

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    Also, generally with boat tail bullets you don't need to bell the case mouth like with handgun rounds. It takes a special die anyways and I only mention it because belling was mentioned earlier.

    With flat based bullets chamfer the inside of the case mouth to get them to start properly.

    The only time you may need to bell case mouths is if you shoot cast bullets.
     

    Younggun

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    Yep, I put a good chamfer on the case mouth and have had no issue with flat base bullets seating properly.


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    unicom

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    Cool. Thanks for all the input from everyone. Hopefully I can resize the cases that are over crimped once I pull the bullet and remove the powder. Should I try to remove the primer or just make sure the to back out the de-primer on the sizing die?


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