FTF, FTE "T" head-stamp 556 reloads

Another trick I use for cases that have been expanded near the base is a 380 bulge buster die. Use case lube.
Hmm, well, I just tried that, and a few of the problem brass now will chamber and extract properly, but most still won't. Is it possible my Lee 223 dies at seeing the shoulder back enough? They're adjusted for the press to slightly cam-over after the fire touches the shell holder.

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Yes but not likely with true cam over . "True" can over means the die and shell holder continue to make contact through out the cam over .

Here are two pictures show what I think would be reasonable to say the press and very light cam over when "NO" case was in the die .Note there is no space/gap between the die and shell holder
SN05Kz.jpg


This is the same die adjustment but when sizing a case . Note there is now a space/gap between the die and shell holder .
h3j3Nj.jpg


This is do to press deflection where you get stretch and or flex in the press or ram linkage . Note the more work hardened or resistant to sizing the case is the more deflection you may have . Other factors like type of lube and caliber/size of case factor in as well .

So if the die and shell holder are making continuous contact throughout the cam over . The case "should" be sized from head to datum enough .
 
I'll have to check, but I don't think any gap opens up while actually sizing brass. I generally set the dies
Sizing die up so I can just feel resistance in the press handle at the end of the stroke.
I'll take a look tonight.

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I have many .223 semi-auto rifles and have no problems at all with the standard dies. I would go out and get a case length gauge and set the dies to minimum on the gauge. I don't have a problem with it as long as I set the dies up properly for the semi rifles. Now I forgot that when reloading for my .308 CMMG Mk3 .308, and loaded about 400rds that wouldn't chamber. They were too long. I resized the loaded ammo with a shoulder bump die and this time I remembered to use a case length gauge to set the die. It worked out just fine.
 
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