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Resizing cases

I have a AR platform chambered in .224 Valkyrie.

My issue is ejecting a unfired round from the chamber after I chamber it.

I have to mortar it out.

Virgin and factory loads no problem ejecting the cases.

checked neck size, case length and OAL against a factory load and find no differance. I even loaded a empty brass after resizing it and same issue. I can find only a .001" differance in the case width between factory and resized cases.

Case OAL is the same.

I have cleaned and polished the chamber.

My resizing dies are RCBS, SB T/C die set.

Any suggestions???
 
What Dusty said, plus full length resize your cases and not neck sizing. These two should take care of the problem.

After posting this, I then noticed you were using factory loads. You might check with another shooter and have them make up a few test rounds that have the correct case dimensions and full length resized.
 
I agree with checking case length and full length size . You may get away with neck sizing on a bolt gun but I would F/L size on a AR , you can also keep from oversizing by using the Redding Competition Shellholders . It come with 5 Shellholders with deck heights .002 lower then normal . Normal being .125 the comp holders are .135 to .127 staying in the .002 - .003 headspace clearance should work fine using the F/L sizing die with full contact.
 
Little confused here.

According to the RCBS website the RCBS, SB T/C dies are designed for the AR platform.

As far as case trim, my brass measures as follows:
Federal virgin brass OAL case of 1.592"
resized and several reloads brass OAL is 1.5925"
Factory Hornandy Match 88 eld's unfired brass is 1.586"
SAAMI spec shows OAL 1.600"

I can understand reamers can vary and so can the chambers.

Do I have the wrong dies??

Or do i need to trim down to 1.5806"
 
You could be jamming the bullets in the lands.

Does the bullet show signs of being in the lands ?

You can candle smoke or use a marker all over the cartridge, then chamber it and eject. The look at where it was rubbing.
 
I thought of that too. Seating bullets (88 ELD's) the same as the factory loads using 88 ELD's, 2.241" OAL bullet length.

My real question is after resizing my bullet and chambering it (just the case unloaded) I need to mortar it out.

A virgin case (federal brass) will come out as normal.

Again checking my resized brass against a virgin Federal case I cannot find any measurement that are off except the width of the case ( center of the case wall before the taper) which is .001" more than the virgin cases (and factory unfired bullets)

Thanks for the suggestion though.
 
After you mortar a unfired cartridge is the overall length and headspace comparator measurements the same as before chambering? If you are jamming the lands you should see a change in oal, unless you are putting a heavy crimp on during seating, which would cause extraction resistance without unseating the bullet. And heavy crimp(seating die not adjusted properly) can expand the body at shoulder junction, if some rounds will not let rifle go into battery this maybe your problem. Run AR's with uniform case length if crimping and always full-length size 3-4 thousandth headspace.
 
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Again checking my resized brass against a virgin Federal case I cannot find any measurement that are off except the width of the case ( center of the case wall before the taper) which is .001" more than the virgin cases (and factory unfired bullets)
Spudgun, it sounds as if you are not sizing the cases enough. In other words, they are too long, Case Head to Shoulder, after sizing.

Do you have the tools to measure or compare Case Head to Shoulder length before and after sizing? Such as the Wilson Case Gage or Hornady Cartridge Headspace Gauge.

Did you set the sizing die as RCBS recommends--that is screwing the sizing die down until it touches the shell holder with the ram in its highest position then screwing it down 1/4 turn more to ensure any slack is removed from the linkage?

Have you verified that the lip thickness of your shell holder is 0.125 inches?

If the die does touch the shell holder at its highest point while sizing a case, try inserting a feeler gauge (thickest that fits) between the shell holder and the cartridge case and sizing it again.
 
WOW, one person says full length die and another says SB dies. I have SB dies now, I do NOT crimp. I just ordered a Full length die and also a case gauge for checking the brass. I have one for every round I reload for but could not find one in town.

RCBS shell holder #19, .125" on the dot.

I wont be able to do much untill the case gauge comes. I know from using them in the past they really do help figure out issues.
 
Using Full length die with full contact between die and shellholder . With the Redding Competition Shellholders , they Come with 5 different Shellholders with .02 deck heights lower then the standard being .125 the comp holders are from .135 to .127 You can size from zero on up for case headspace with full contact no crimp necessary .
 

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