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  #1  
Old 10-09-2009, 10:41 AM
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minimum seating depth of bullet


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I have read the manuels about how to determine bullet seating. But with a .243 there is a great difference in bullet length from a 55 grain up to a 107 grain bullet. So my question is how deep is the least a 60 or 80 gn. bullet should be seated into the brass.


THANK YOU ROD
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Old 10-09-2009, 11:02 AM
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Rod,

Most reloading manuals will give you a specific OAL for the bullet you are reloading. If you do not have that information, I would suggest loading the bullet into the case until it reaches the bottom of the case neck. For a .243Win this is .240". Check to see that this round will chamber easily and that it will cycle from the magazine of your gun cleanly.

If the round chambers and cycles well, shoot it for accuracy and watch for the usual signs of pressure. If it shoots a great group, you have a simple solution for that particular bullet. If not, experiment with loading it a little further out, in increments of say .005", until you find a OAL that shoots well. Again, watch for difficulty in closing your action or excessive pressure, as you load the bullet further and further out in the case.
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Old 10-09-2009, 11:59 AM
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Also you probably will be limited to a length that will feed from your magazine.
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Old 10-09-2009, 12:56 PM
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As stated above, magazine length will normally dictate cartridge OAL.

However, if your rifle will accept longer OAL's, I've always tried to obtain at least one diameter of depth for the particular bullet as minimum. This doesn't always work for certain calibers, such as a .223 Rem., but if it does and the bullet is within .020" of the lands, I call it good.
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Old 10-09-2009, 01:16 PM
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"...how deep is the least a 60 or 80 gn. bullet should be seated into the brass."

Realistically? If the bullet won't fall out with normal handling it's okay. That's it.
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Old 10-09-2009, 01:21 PM
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The Problem With The 60 And 80 Grain Is Not Oal Because Even If You Only Seat Them .001 They Are Not Going To Be Too Long. What I Need To Know What Is The Least They Need To Seated Into The Neck. Do They Need To Go To Where The Neck Meets The Shoulder . Or Is 1/8 Of An Inch Ok.


Thanks Again
Rod
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Old 10-09-2009, 02:02 PM
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No. You only need them seated deeply enough that the bullet will not:

a) Be jammed into the throat, which raises pressure.

or

b) Won't come loose and fall out, with the exception described below.

Middleton Tompkins has more long range gold medals than anyone else, living or dead, as far as I know. At a clinic I attended he told us he sizes his case necks so the bullet slip in them under finger pressure. He seats them way out and lets their contact with the throat finish seating them as he closes the bolt. This technique requires you use a somewhat lower powder charge to compensate for the higher pressure throat contact causes. It has the drawback that if a cease-fire is called, you have to go to some trouble to unload the gun. The bullet usually sticks in the throat, so you must tip it muzzle-up first, then extract the case slowly or you will spill powder into your action. Then the bullet has to be knocked out of the throat with a cleaning rod.
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Old 10-09-2009, 02:05 PM
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Quote:
Originally Posted by 2433006300 View Post
The Problem With The 60 And 80 Grain Is Not Oal Because Even If You Only Seat Them .001 They Are Not Going To Be Too Long. What I Need To Know What Is The Least They Need To Seated Into The Neck. Do They Need To Go To Where The Neck Meets The Shoulder . Or Is 1/8 Of An Inch Ok.


Thanks Again
Rod
General rule of thumb is to seat your bullets at least one calibre deep; .243" into the neck of the case. I have gotten away with shallower seating, but you need to have a tight grip on the bullet to do this.
1/8" is a little shallow, but if you can't push the bullet in once seated by pushing the tip of the bullet against the edge of your loading bench, all's good!
The difference in COL probably won't make much difference to accuracy, as long as it feeds without moving in the case, you'll probably get good accuracy.
The reason that you don't shallow seat is to enhance accuracy by allowing the bullet to move a little more upon initial firing so that it reaches the lands with a bit of steam behind it, if it leaves the neck early, it can have enough time to tip before it engages the lands, which will ruin accuracy.
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Old 10-09-2009, 03:21 PM
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thanks to all of you
Rod
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  #10  
Old 10-09-2009, 03:49 PM
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What unclenick said..
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