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- Thread starter ZREXER
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Measure a fired case from your Tavor, the resized case body should be .003 to .005 smaller in diameter than a fired case.
If you buy a JP Enterprise .223 case gauge your cartridges will fit in any chamber. This gauge is made from a finish chamber reamer cut to minimum SAAMI dimensions.
Below a Wilson, Dillon and JP Enterprise .223 gauges with cases placed in rim first. The JP Enterprise gauge is smaller in diamter and the .223 case did not drop as far into the gauge.
Bottom line this gauge will let you know if you need a small base die, and if your cases do not drop in all the way into the gauge then its a case diameter problem.
Also do not forget the Tavor chamber might have tighter headspace and you may not be bumping the shoulder back far enough.
NOTE, a small base die will size the cases .002 to .003 smaller in diameter and also push the case shoulder back further than a standard die.
A small base die will size the case back to minimum SAAMI case dimensions, and you will need to adjust the die for proper shoulder bump.
This is the reason small base dies get a bad rap about case head separations because it "WILL" push the shoulder back more than a standard die.
Below I had to place a .004 feeler gauge between the shell holder and the die when adjusting the die downward to get the same amount of shoulder bump as my standard die.
If you buy a JP Enterprise .223 case gauge your cartridges will fit in any chamber. This gauge is made from a finish chamber reamer cut to minimum SAAMI dimensions.
Below a Wilson, Dillon and JP Enterprise .223 gauges with cases placed in rim first. The JP Enterprise gauge is smaller in diamter and the .223 case did not drop as far into the gauge.
Bottom line this gauge will let you know if you need a small base die, and if your cases do not drop in all the way into the gauge then its a case diameter problem.
Also do not forget the Tavor chamber might have tighter headspace and you may not be bumping the shoulder back far enough.
NOTE, a small base die will size the cases .002 to .003 smaller in diameter and also push the case shoulder back further than a standard die.
A small base die will size the case back to minimum SAAMI case dimensions, and you will need to adjust the die for proper shoulder bump.
This is the reason small base dies get a bad rap about case head separations because it "WILL" push the shoulder back more than a standard die.
Below I had to place a .004 feeler gauge between the shell holder and the die when adjusting the die downward to get the same amount of shoulder bump as my standard die.
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###Measure a fired case from your Tavor, the resized case body should be .003 to .005 smaller in diameter than a fired case.
If you buy a JP Enterprise .223 case gauge your cartridges will fit in any chamber. This gauge is made from a finish chamber reamer cut to minimum SAAMI dimensions.
Below a Wilson, Dillon and JP Enterprise .223 gauges with cases placed in rim first. The JP Enterprise gauge is smaller in diamter and the .223 case did not drop as far into the gauge.
Bottom line this gauge will let you know if you need a small base die, and if your cases do not drop in all the way into the gauge then its a case diameter problem.
Also do not forget the Tavor chamber might have tighter headspace and you may not be bumping the shoulder back far enough.
NOTE, a small base die will size the cases .002 to .003 smaller in diameter and also push the case shoulder back further than a standard die.
A small base die will size the case back to minimum SAAMI case dimensions, and you will need to adjust the die for proper shoulder bump.
This is the reason small base dies get a bad rap about case head separations because it "WILL" push the shoulder back more than a standard die.
Below I had to place a .004 feeler gauge between the shell holder and the die when adjusting the die downward to get the same amount of shoulder bump as my standard die.
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There we go.
I'm surprised in doing some research before buying the dies and other components that small base dies didnt pop up to the forefront as to be the first thing to buy.
Rob
Is there any chance your reloads are too long and the bullet is into the lands? I doubt that it is, but that'll cause hard chambering too.
If your sized case diameter is .003" less than the fired dimension I don't see that being the problem. I don't have experience with that rifle though.
Is the shoulder back to where it should be?
If your sized case diameter is .003" less than the fired dimension I don't see that being the problem. I don't have experience with that rifle though.
Is the shoulder back to where it should be?
The Dillon sizing dies are small base dies, and they suggest a headspace gauge be used to make sure the shoulder is not bumped back too far.
Again there is nothing wrong with using a small base die as long as you know the die will push the case shoulder back further than a standard die.
Dillon Carbide Rifle Dies
https://www.dillonprecision.com/dillon-carbide-rifle-dies-individual-three-die-sets_8_4_24498.html
"Sizing/Depriming Die
The sizing/depriming die is full-length and sized to minimum tolerances to size cases down to function in both semi and fully automatic firearms. We strongly suggest that a headspace case gauge be used to correctly adjust the size die."
NOTE, chambers and dies can vary in size.
Example I have a standard .223 Lee full length die that will size the cases smaller than my RCBS small base die.
On the flip side of this you can have a die closer to maximum sizing dimensions and not size the case enough for a semi-auto.
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I've never used a small base die for my AR, and I've never had an issue. However, I bet the Tavor is a tighter chamber, on the rounds that are not going into battery, are there any marks on the brass that stand out? Also, make sure to double check that you cleaned everything Tavors come pretty heavily coated out of the case. I would suspect your issue is more related to there being left over packing grease somewhere in the rifle.
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Northaways
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I buy bulk once fired Lake City 5.56 cases and size them the first time with a small base die. The problem is I'm loading for three different AR15 rifles and one of them belongs to my son so my small base die get used more. If the cases are just fired in your rifle then there is a very good chance a standard die will work fine.
Small base dies are a pretty good investment if you are going to use the calibre over the long term. There is more variance between chambers and between dies than most might think. It's only a matter of time before you match a minimum spec chamber with a max spec die and have a problem.
Pr589, you must be almost as smart, good looking and modest as I am.
I have resizing die OCD and not all my 223 dies are in this photo. And you would be amazed at how much the dies vary in diameter and shoulder location.
Or how much your chambers can vary in size. The throat in my Savage 223 bolt action is longer than the throats in my two AR15 rifles.
