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Abram
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Posted: March 05 2018 at 11:22am | IP Logged Quote Abram

I have a question that perhaps you folks can answer. I am sitting at the bench full length resizing some 308 cases. Each one I stick into a case gauge to verify that it is resized accordingly. As I put one in the gauge it stops right at the rim, strange I thought, this same case has been fired at east three times. I use an RCBS X-die hoping to get as much case life as I can. I also use the paper clip to try and check for thinning. What would cause the case to stop at the rim of the cartridge?

Thank you
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RT58
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Posted: March 05 2018 at 2:17pm | IP Logged Quote RT58

Is the die adjusted down according to the directions?

Did you perform the initial trim?
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Abram
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Posted: March 05 2018 at 4:10pm | IP Logged Quote Abram

Yes the die is adjusted according to the instructions. I always verify before I start. I do not remember performing the initial trim but would that anything to do with the case not hanging on the rim?
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hoghunter
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Posted: March 05 2018 at 5:10pm | IP Logged Quote hoghunter

Is the case bulged just ahead of the rim?

What case gage are you using?

Generally, overall case length will not affect the head space measurement of the case in a Wilson style case gage.

Neck could be significantly out of round although I've never seen one that badly out round that causes the case to stick out of the gage.

Mostly likely cause is excessive head space which can cause the case to protrude beyond the upper step in a Wilson style case gage. This could be signs of a dangerous condition i.e. potential head separation.

Full sizing die should be set up so you are not over sizing the case. For bolt rifle the die should push the shoulder back about .001 to .002" from a fired case in the specific rifle you are loading for. Over sizing can produce excessive case stretch when fired leading to head separation.


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RT58
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Posted: March 05 2018 at 5:58pm | IP Logged Quote RT58

Abram wrote:
I do not remember performing the initial trim but would that anything to do with the case not hanging on the rim?


I'm not sure since I've never used a case gauge. I just figured they would gauge all the important measurements to ensure proper safety.

According to RCBS the X dies do not stop the case from growing, they just keep it at a minimum.
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M700
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Posted: March 05 2018 at 9:07pm | IP Logged Quote M700

Guess I don't understand.

Are you trimming the cases to the proper length?

Are they the proper length?

If not, there's a problem. If so... What's the problem?

Like I said, I don't understand.

I've only loaded and shot a 10,000+ of 308 Win cases.

Guy
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Abram
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Posted: March 06 2018 at 2:45pm | IP Logged Quote Abram

I am trimming the cases to the proper length. In some instances a few have been trimmed shorter than 2.00 but I did not think it would cause a problem like this or any problem for that matter.

I am using a Lyman case gauge to check the cases, it has served me well over the 10 little years I have been reloading, I trust it.

The case is not seating all the way in the case gauge when I go to check them, it stops right at the rim. The rim is actually sitting on the case gauge so the entire body is in the case gauge. It is like the rim itself has increased in diameter and it is confusing me as to why.
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Buffalogun
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Posted: March 06 2018 at 4:10pm | IP Logged Quote Buffalogun

Abram wrote:
this same case has been fired at east three times.
Thank you


Abram,

Measure the diameter of the rim. If the rim diameter has grown to the point that it will not fit inside the gauge, it may be time to replace that brass.

If you are loading close to max pressures and your lot of brass is a little soft, the rim diameter could have grown. This could be accompanied by slightly enlarged primer pockets.

How do you prime your cases? A hand held priming tool will enable you to quickly detect if the primer pockets have enlarged, as the new primers will be much easier to seat.



Mike

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Abram
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Posted: March 07 2018 at 11:19am | IP Logged Quote Abram

I prime using my Lee Press. I failed to mention these are LC cases begin fired in a M1A or Garand and they may have come to the end of their life, I will check my records again but I think this was only the third firing, one more and I was going to toss them, oh well better to just toss them.

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REM1875
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Posted: March 08 2018 at 8:39pm | IP Logged Quote REM1875

Small base dies especially for rounds fired from semi
automatics?

Small Base Dies
A Small Base Die is just another type of full-length
sizing die, but one that is typically used when
reloading for semi-automatic rifles, like the AR-15,
M14, or AR-style .308 rifles. (It may also work well
for bolt guns that need extra sizing on the lower
section of the case.) A small base die works exactly
like a full-length sizing die, only it compresses the
brass just a bit more, usually about .001″ more, and
may even push the case shoulder back just a hair.
Small base dies give that extra bit of compression to
the brass to help make sure the case will properly
extract from a semi-automatic firearm. The upside is
that you get precision handloads that should work
flawlessly in your semi-automatic. The downside is
case life is really shortened, especially compared to
brass used only in one bolt-action rifle, because the
brass is worked more.

http://bulletin.accurateshooter.com/2015/05/intro-to-
full-length-dies-neck-sizing-dies-and-small-base-dies/

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RT58
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Posted: March 10 2018 at 7:51am | IP Logged Quote RT58

From Lyman's website:

"To achieve the highest degree of safety and accuracy, Lyman recommends that all bottleneck rifle cases be inspected after resizing to ensure that the proper headspace dimension is maintained. The best way to check this critical dimension is with a Lyman case length/headspace gauge. The reloader simply inserts the case into the gauge to insure that it does not exceed the maximum or fall below the minimum allowable headspace. In addition, the gauge will identify a case which exceeds the maximum allowable case length. Caution: Any case found with excessive headspace should be destroyed immediately. Lymanís Rifle Case Length Headspace Gauges will eliminate the guesswork with rifle reloading. Order yours today!"

Apparently they do check overall case length, but that can easily be measured for accuracy.

The other problem is the headspace. If you resize a case and it shows a problem with the headspace they are telling you to discard it. What if the case isn't the problem? If the sizing die is not properly adjusted for full length sizing or is being used for "bump" sizing or partial sizing to fit a particular firearm, it may not fit the gauge properly.

That's why I've never used them. I don't care if they fit every firearm chambered for that caliber, I only care if they fit mine and I'd rather have a "custom" fit than a "minimum to maximum case size" fit.

Rem's article on small base dies is way too generic. Small base dies vary by manufacturer and the purchaser should know their differences in order to choose what best suits his needs.

Edited by RT58 on March 10 2018 at 7:54am
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