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How to figure Bullet seating depth

 
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  #1  
Old 04-07-2013, 12:31 AM
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Join Date: Mar 2011
Location: Reno, Nevada
Posts: 950
How to figure Bullet seating depth

How do you guys figure your bullet seating depth?

What tool do you use ?

I have the sinclair bullet seating tool and a stoney point....................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 and it never goes back to 0
So far everything appears to be easy but this...................I would bet that When testing for accuracy I have loaded rounds that might be .005 to .020 different.


Greg
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  #2  
Old 04-07-2013, 11:19 PM
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Join Date: Sep 2012
Location: Grand Island NY
Posts: 31
Re: How to figure Bullet seating depth

This is going to sound rough but has worked for me...

Size a case.

Seat a bullet way long past specs, like .100"

Record Cartridge Over All Length.

Chamber the "dummy round".

Measure the "dummy round" again, record length. (chambering should push the bullet into the case some.)

Using the inside part of the calipers, measure the marks left by the rifling to the case mouth.

The difference between Chambered COAL and the marks on the bullet from the rifling give you where the rifling starts.

Subtract another (.020"?) whatever you want to seat the bullet from the lands.

Hope that made sense.

So to answer your question, my "tool" that I use is a "dummy round".

Another tool to get for the calipers in the Ogive attachment. This lets you consistently measure COAL from the Ogive of the bullet. Instead of the tip of the bullet which is inconsistent.
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  #3  
Old 04-08-2013, 12:04 AM
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Join Date: Oct 2008
Location: Alabama
Posts: 6,126
Re: How to figure Bullet seating depth

Quote:
Originally Posted by Magnum76 View Post
This is going to sound rough but has worked for me...

Size a case.

Seat a bullet way long past specs, like .100"

Record Cartridge Over All Length.

Chamber the "dummy round".

Measure the "dummy round" again, record length. (chambering should push the bullet into the case some.)

Using the inside part of the calipers, measure the marks left by the rifling to the case mouth.

The difference between Chambered COAL and the marks on the bullet from the rifling give you where the rifling starts.

Subtract another (.020"?) whatever you want to seat the bullet from the lands.

Hope that made sense.

So to answer your question, my "tool" that I use is a "dummy round".

Another tool to get for the calipers in the Ogive attachment. This lets you consistently measure COAL from the Ogive of the bullet. Instead of the tip of the bullet which is inconsistent.
I do the whole dummy round deal, too. I use an old cleaned and size case (no primer or powder).
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  #4  
Old 04-08-2013, 03:22 AM
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Join Date: Jun 2011
Location: SW Colorado
Posts: 270
Re: How to figure Bullet seating depth

This is the method that I use and it is very accurate!!!

Simple, Low-Cost Length-to-Lands Gauge Daily Bulletin

Mike
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  #5  
Old 04-08-2013, 09:02 AM
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Location: Grand Island NY
Posts: 31
Re: How to figure Bullet seating depth

Nice I like that too.
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  #6  
Old 04-08-2013, 09:51 AM
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Join Date: Mar 2013
Location: west utah
Posts: 11
Re: How to figure Bullet seating depth

That is the way I have always done it.
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  #7  
Old 04-08-2013, 11:06 AM
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Join Date: Feb 2011
Location: Cincinnati, Ohio
Posts: 1,909
Re: How to figure Bullet seating depth

I blacken my bullet with dark blue or black Sharpie. And when I feel the bolt close I open and close the bolt 2-3 times VERY GENTLY....that way I get a good heavy mark where the rifeling ends
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