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Seating depth

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  #1  
Unread 05-08-2010, 02:07 AM
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Join Date: Dec 2009
Location: Buckley, WA
Posts: 30
Seating depth

Since I have started reloading, I have only reloaded 1 type of bullet (Nosler CT Ballistic Silver tip). I am going to try a different type (Nosler AccuBond).
I have found that the 2 different bullets have different seating depths (COAL measured @ OGIVE, CT Ballistic tip = 3.275, AccuBond = 3.318).
To determine my seating depth I am using a fire formed case with a slightly crimped neck with a sharpie colored bullet, chambering it 3 times recording the measurements then after determining the avg. subtracting .015.
Is it common that 2 different types of bullets would have such variance in COAL? It seems odd to me.
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  •   #2  
    Unread 05-08-2010, 03:28 AM
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    Join Date: Apr 2008
    Location: South Texas
    Posts: 55
    Re: Seating depth

    Quote:
    Originally Posted by Rickyrebar View Post
    Is it common that 2 different types of bullets would have such variance in COAL? It seems odd to me.
    Is this attributed to the locale of the ogive on the specific bullet?

    Several days ago, I used that small itty-bitty barrel bit that Darrell Holland sent to me with my new 708...he used a chamber reamer and cut for about 3/4" into the bore and included it with my rifle.

    I never had the guts to ask...

    But after a year or so of contemplating, I determined it is the most accurate method to set OAL I am aware of.

    Very consistent results!
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      #3  
    Unread 05-08-2010, 04:44 AM
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    Join Date: Jan 2007
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    Re: Seating depth

    The Hornady Comparator will produce much more accurate results. Ogive is where the straight shank of the bullet stops and the taper to the tip begins. There are always differences between various brands and weights of bullets; even the same bullets within the same box or lot, can vary. Consistent seating to the same depth, after you know which OAL is best, is what you want. You need the comparator to do this.
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      #4  
    Unread 05-08-2010, 07:05 AM
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    Join Date: Feb 2008
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    Re: Seating depth

    Ricky,
    To answer your question, it is common to have different COAL with different bullets, as their ogive measurement from base of bullet is different for each one.
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      #5  
    Unread 05-08-2010, 09:30 AM
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    Join Date: Apr 2008
    Location: South Texas
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    Re: Seating depth

    Quote:
    Originally Posted by Gene View Post
    The Hornady Comparator will produce much more accurate results.
    Gene,

    I better sit down with my Hornady Comparator and learn how to use it correctly. I felt months ago, when I took some measurements on specific bullets, I had it down.

    After going back to remeasure, I find I have quite a "spread" in values. Apparently I have no feel and poke some into the lands and others slightly touch...there has to be a way to consistently duplicate.

    Wally
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      #6  
    Unread 05-08-2010, 02:07 PM
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    Join Date: Jan 2007
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    Re: Seating depth

    Wally, I have a confession to make. I have the Hornady comparator, bought it when Stony Point made them, and did not feel it was perfect. Then I bought the Davidson base and several nose pieces from Sinclair, and found them to be superior. But many readers are not familiar with The Davidson or Sinclair, so I recommended the Hornady. I take back that statement. Look at the Davidson Seating Depth Checker. It does provide spot on measurements. Of course, there are still differences in bullet ogives. I actually seat my bullets about .005" long initially, then work them down with the Redding micrometer seater until they are exactly where I want them.
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      #7  
    Unread 05-09-2010, 05:48 AM
    Miller Outdoors
     
    Posts: n/a
    Re: Seating depth

    I kinda to this the redneck way. I take a sized, unprimed case and stand it up primer side down - I take a small round file and file right through the middle of the neck down to the shoulder. I then size it again. I take whatever bullet I'll be using and just get it started in the case with my fingers - then I unscrew the seating die a few turns and lower the arm to raise the bullet into the die. I screw the top of the die down until I feel tension, then a few more turns until I know it's started straight. I put it in the gun and close the bolt firmly, then carefully eject the shell and measure and record the overall length. I do this three or four times (you can pull the bullet back out of the neck with firm finger pressure) until I'm certain that the measurement is correct. I start loading by subtraction .02 from that overall measurement. It has worked well for years.
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