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Push through case gauge failures

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I have started push through sizing my 40 brass in an attempt to reduce my case gauge failure rate. Unfortunately it hasn't helped much. I don't understand how a case can fail case gauge if it has been push through sized. Any help is appreciated. Thanks.

 

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Have you tried just a sized only case in your case gauge that will tell you when to problem is created. Also take your calibers and measure you loaded rounds to see if it’s to much crimp.

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How do they fit in the chamber of your barrel ?  That is really the most important reason to use a push through set up.  Case gauges will usually be "tighter" than the actual chamber of the barrel.

 

Try just a sized (pushed thru) empty case and then try one of your loaded rounds.  That will let you determine if the case is sized properly and then determine if your loaded round has a problem.

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Perhaps it’s your bullet profile and/or OAL


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The cases (unloaded) do not all (~10%) fit the gauge. All will chamber in the pistol, but are sticky.

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Try a different die in your push thru device.  (You did not mention which brand you are using)

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Currently using a lee u die. Are there others known to be smaller?

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Where on the rounds are they failing to enter the gauge?  The case mouth?  The rim?  Somewhere in between?

 

If you haven't yet, try coating the rounds that fail with Dykem (I use Sharpie as an alternative) and see where they stick in your chamber or what portion is contacting the case gauge .

 

It could be bullet profile engaging the throat/rifling of the chamber, non-concentric bullet seating causing the case to bulge a little to one side, etc.

 

Do the cases gauge if the round is inserted backwards?

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If they case gauge perfect after sizing then the problem is in your bullet seating. Crooked, oversized bullets, not quite enough bell or crimp or something else in the process.  

 

 

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Those u die have been know to be defective, or have gone bad.. A little more info about what you are loading with help with feedback as well .. Bullets, OAL, and type of gun.. 

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1 hour ago, Furrly said:

Those u die have been know to be defective, or have gone bad.. A little more info about what you are loading with help with feedback as well .. Bullets, OAL, and type of gun.. 

Only die I ever had “go bad” was Dillon. U die has always been rock solid

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22 minutes ago, Sarge said:

Only die I ever had “go bad” was Dillon. U die has always been rock solid

I've had a different experience 

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Empty cases hang up at the web, I can see the rim and grove above the gauge. Curiously, if inserted backwards they drop all the way in. This doesn't make much sense to me.

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It would seem from that the mouth of the case is the largest portion of the case.  Perhaps the gauge gets tighter toward the lower end.  

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Posted (edited)

try sizeing the empty cases in your regular die

( the ones that failed)    and re check                          

Edited by AHI

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Are you push-through sizing with an undersize die or a regular die? 

 

Are you sizing again during reloading?  If so, is that a U-die, too?

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Push through with a u die. Traditional sizing with a standard Dillon die.

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You could get another U die and use it in the press instead of the Dillon.  Also you could try the new one in your push thru setup and see if anything turns out different with the new die.  Lee dies are usually correct - dimension wise - but I'm sure a non-spec one could slip thru every once and awhile.

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I believe your problem is too much bell and it isn't getting completely removed in seating and crimping.  I had the exact same problem with Dillon dies.  A Mr Bulletfeeder expander/funnel will cure that and several other problems.  It is a two step expander designed to hold the bullet vertically in the case so it doesn't tip when indexing.  A benefit is you need only a microscopic bell and the Dillon seating dies takes care of that.

 

I was not willing to spend the time push through sizing.  I now load on a Hornady LnL with Hornady dies.  I use the Mr Bulletfeeder expander, only seat with the Hornady seating die, and crimp with a Lee Factory Carbide Crimp Die.  With this setup, the only failures I get in the Shockbottle/Hundo are caused by a too sharp extractor dinging the rim.  I remove those, fill down the burr and the drop in fine.  The Lee die resizes the case as it crimps.

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