30-06 case length???
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Old 06-14-2014, 06:14 PM   #1
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Default 30-06 case length???

Hey guys I just started reloading 30-06 and came to a road block at max case length..

Now I know sammi specs are at 3.34" as a max but I got some weird numbers when measuring my gun just now..

I have a tc dimension rifle, and started with a bullet in the barrel with a pencil holding it against the lands.. Next I took a cleaning rod to the tip of the bullet and made a tape mark.. Then took the bolt and closed it all the way and did the same with the cleaning rod against the bolt face.

The result number I got was 3.165" as my max case gauge... Now to confirm this I then took a bullet covered in sharpie and slowly step by step seated it deeper untill when I put it into the rifle there was no binding and the black sharpie marks were not touched then took this out and it measured at 3.160"..

Now what I'm not grasping is how my gun is so far off from max length, and that most of my other 165gr ammo is 3.21" long and never had problems with them..

Could my gun really be that short? With the space for variance I'm looking at a 3.15 overall length.. This just doesn't sound right to me..

Has anyone else gotten this low of a number? And should I load to gun length or to factory ammo leggy instead?


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Old 06-14-2014, 08:18 PM   #2
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Overall length can vary a lot. Actual case case length can not. The max OVERALL length is 3.34" but loading much shorter ones is fine (though in some instances accuracy may suffer).

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Old 06-14-2014, 09:56 PM   #3
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What bullet are you trying to load up? Have you checked a factory cartridge with a sharpie to see if it is touching the lands?

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Old 06-14-2014, 11:17 PM   #4
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Originally Posted by NotMormon View Post
What bullet are you trying to load up? Have you checked a factory cartridge with a sharpie to see if it is touching the lands?

I'm using Sierra 165 gr HPBT, and no I haven't tried with a factory round since the only 165 gr ones I have are hornady and just realized the bullets are way different. Here's a look at them..imageuploadedbyfirearms-talk1402787797.482726.jpg


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Old 06-14-2014, 11:47 PM   #5
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That there would make the difference. They have a significantly different ogive not to mention they are HP. If you were loading the same Hornady, you would notice that your OAL would be quite longer than the max using the cleaning rod technique. Go ahead and load em up. You will be fine. My 06 really likes those 165 HPBT's. Been a while since I've loaded any but IIRC, my OAL with those is around 3.20".

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Old 06-14-2014, 11:50 PM   #6
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measuring from the point of the bullet is not a terribly accurate method and basic saami spec is not good enough. you need to use the max coal from the load manual for the specific bullet in question.

reason being is the widest furthest forward point of the bullet. the bullet maker takes the difference between the ogive and the bullet tip into consideration when listing a max oal.

to find your rifle's true allowable max oal you need a bullet comparator modified case and calipers.

trying to determine coal with tape sharpies and measuring sticks is going to cause a kaboom at some point.

get the proper tools to do it correctly and safely.

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Old 06-14-2014, 11:57 PM   #7
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Yip! The right tool for the job is always the best way to go.

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Old 06-15-2014, 12:14 AM   #8
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in this case not using the right tool can kill you or put you in intensive care...

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Old 06-15-2014, 12:27 AM   #9
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Quote:
in this case not using the right tool can kill you or put you in intensive care...
Ah. Regardless of overall case length a loaded round that does not touch the rifling and is otherwise loaded to spec can hardly blow the rifle up and kill you.
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Old 06-15-2014, 12:42 AM   #10
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Quote:
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Ah. Regardless of overall case length a loaded round that does not touch the rifling and is otherwise loaded to spec can hardly blow the rifle up and kill you.
I'm one of those "unsafe" re-loaders being that I don't use a case length gauge and all the fancy expensive stuff that makes you get .1" groups. There are other methods to determine OAL Edit: and bullet jump Edit: without spending your hard earned cash. However, I do believe that SOME people should use them.

Loads on the upper end of the scale touching the lands on a 100 degree day COULD end badly.
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