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Max Online: 16728 @ 03/25/12 08:51 AM
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#6313878 - 05/27/16 06:25 PM checking barrel length question
TackDriver Online   content
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Registered: 05/02/14
Posts: 663
Can this chamber neck gauge be used to check barrel length for crunching numbers in Quickload, the way I am doing it is just use case with the gauge inside the mouth and push the case inside the chamber until it seats as far as it can go, but do not use the bolt and use a Dewey rod from the muzzle end and touch the case with it and mark the rod and measure for barrel length? Just trying the easier way.


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#6313881 - 05/27/16 06:27 PM Re: checking barrel length question [Re: TackDriver]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 11492
Loc: Lewisville, TX
Barrel length is closing the bolt on an empty chamber, and measuring with a rod from the bolt face to the end of the barrel.
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#6313884 - 05/27/16 06:29 PM Re: checking barrel length question [Re: ChadTRG42]
TackDriver Online   content
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Registered: 05/02/14
Posts: 663
Originally Posted By: ChadTRG42
Barrel length is closing the bolt on an empty chamber, and measuring with a rod from the bolt face to the end of the barrel.


Damn, never knew that. I thought the rifling was used to measure length. But thanks for the info Chad.

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#6313908 - 05/27/16 07:03 PM Re: checking barrel length question [Re: TackDriver]
kmon1 Online   content
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Registered: 09/27/06
Posts: 22232
Loc: Texas
yup Chad is spot on as usual.

For quickloads use the boltface measurement. The line "bullet travel" in quickloads is the barrel length (end to boltface) - case legnth + seating length to base. In the capture below for a 308 22-2.014+.510=2.496 bullet travel which accounts for the distance the base of the bullet travels before leaving the barrel, or the distance the bullet is under pressure and accelerating after powder starts to burn




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#6314410 - 05/28/16 12:09 PM Re: checking barrel length question [Re: ChadTRG42]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 21751
Loc: Wolfe City, TX
Originally Posted By: ChadTRG42
Barrel length is closing the bolt on an empty chamber, and measuring with a rod from the bolt face to the end of the barrel.


That's correct, but I wonder how many ATFE agents know that?
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#6314888 - 05/28/16 09:26 PM Re: checking barrel length question [Re: TackDriver]
TackDriver Online   content
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Registered: 05/02/14
Posts: 663
Thanks, my assumption was wrong, thought only the lands was needed as a measurement.

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#6314891 - 05/28/16 09:28 PM Re: checking barrel length question [Re: TackDriver]
passthru Offline
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Registered: 12/05/06
Posts: 11150
Loc: Saginaw, Tx
Same with a shotgun?
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#6316098 - 05/30/16 09:54 AM Re: checking barrel length question [Re: TackDriver]
papa45 Online   content
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Registered: 05/14/07
Posts: 584
Loc: Arlington
passthru: I believe the answer is yes; all the same for rifle, shotgun, and auto pistol. Only thing different is revolver, which is end of forcing cone (in front of the cylinder) to the front end of the barrel.

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