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How to figure Bullet seating depth

 
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  #8  
Old 04-08-2013, 05:04 PM
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Join Date: Apr 2013
Posts: 1
Re: How to figure Bullet seating depth

Very useful information. Thanks all.
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  #9  
Old 04-08-2013, 05:41 PM
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Join Date: Jun 2012
Posts: 7
Re: How to figure Bullet seating depth

I do something very similar to what the others have listed. I found that sometimes the bullet wants to "stick" in the lands when pushing into the case so I made a "dummy" case same as the others have described. Then I used a dremel tool to split the neck of the case on both sides, thus letting the bullet slide into the case a little easier without getting stuck in the lands. This also lets me slide it out and re-measure several times to get an average. I also now use a tool to measure the length to the ogive as another has suggested, instead of measuring overall length. This gives you the length to the lands, you then can back off from there.

I always start a master list then for each rifle and bullet combo as to the LTL (length to lands) that I keep in my book for reloading.

This works for me but always keep an open mind for something better.

Theo
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  #10  
Old 04-08-2013, 06:04 PM
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Join Date: Apr 2012
Posts: 161
Re: How to figure Bullet seating depth

The Hornady(formerly Stoney Point) Overall Case Length Gauge works for me.
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  #11  
Old 04-08-2013, 06:36 PM
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Join Date: Sep 2009
Location: Malta NY
Posts: 718
Re: How to figure Bullet seating depth

I found that the occasional flyer dissapeared when I load each round by checking Ogive contact to case base length after having determined with Hornady/Stoney point the length to the lands. I often put a dummy round together for future reference.

Basically I back off the seating die a bit, seat the bullet, measure base to ogive and tweak the micrometer die to get the ogive to lands distance exact. Slow exacting process but I am not loading in the gross and its part of the process of tinkering I like.

If the cone in the die that accepts the point of bullet is perfect fit for the bullet tip, this would likely be unnecessary as the measurements would be consistant.

Many feel this is wholly unnecessary to begin with.

Each to their own I suppose but while this level of tedious effort is not necessary for a lot of my rifles it has proven to make a difference with a couple. My -06AI is particularly sensitive.

I doubt this porcess would be of any value if I was shooting jambed into lands but when I set up my load for my hunting riifle, I wanted to make sure I could unload a round without pulling bullet and spilling powder. However rare that might be, it is too often.
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  #12  
Old 04-08-2013, 07:00 PM
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Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
Posts: 1,596
Re: How to figure Bullet seating depth

"What I did learn was that you need a good pair of Calipers, not like the ones I bought 20 years ago from Midway for $20 I get a different reading each time ..."

The Midway and other Chinese calipers are quite good, especially so for reloading needs, and the prices make it rational for everyone to have them. The skill/touch required to use calipers and micrometers accurately and consistantly isn't as simple as many seem to presume, especially so on a curved surface like a bullet ogive.

"...and it never goes back ..."

Inconsistant gage zero comes from dirty jaws. Close the jaws on a clean sheet of paper and draw the paper out to clean.
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  #13  
Old 04-08-2013, 07:28 PM
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Join Date: Jul 2007
Location: Billings, Mt
Posts: 782
Re: How to figure Bullet seating depth

Quote:
Originally Posted by boomtube View Post
"What I did learn was that you need a good pair of Calipers, not like the ones I bought 20 years ago from Midway for $20 I get a different reading each time ...
Inconsistant gage zero comes from dirty jaws. Close the jaws on a clean sheet of paper and draw the paper out to clean.
Have your wife save them anti static tissues she puts in the dryer when she is done with them. Wipe your caliper jaws down.

I also use these old anti static sheets cut up and throw into my brass tumbler. No more little static particles to deal with. If you dump your brass/media though a screen sieve just pick out the pieces of black carboned up tissue and put in garbage. Best anti static wipe down cloths I have found.
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  #14  
Old 04-09-2013, 02:17 PM
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Join Date: Jan 2012
Location: Bean Patch
Posts: 193
Re: How to figure Bullet seating depth

I use a fired case. deprime it then thread the primer pocket with a tap. I believe it is a 5/16 x 36 thread. this will then thread on my Hornady OAL gauge.
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