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Old June 8, 2014, 04:04 PM   #1
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.308 resizing issue

I am using RCBS Small base dies and a EGW chamber checker. About every 10 to 15 cases I get one that is not passing the chamber check, the head is sitting slightly above the top of the chamber checker. All cases are trimmed to same length, if that's even relevant. I re-calibrated the resizing die according to the instructions, I just can't figure out why I'm getting the occasional case that wont fit in the chamber even after using small base dies?? Is this normal? Do I toss these cases out or is there anything I can tweak to fix this? Appreciate any input.
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Old June 8, 2014, 04:44 PM   #2
Bart B.
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I think what's happening is your press has enough spring that the die doesn't go all the way down sizing all the cases the same amount. That's why your case heads stick out of the case gauge varying amounts.

When your case is all the way up into the sizing die, does the bottom of the die touch the shell holder?

Your die may need to be turned down into the press; just a tiny bit. And mount that moves the circumference around about 1/4 inch is probably enought.

You can put one of these labels on your die lock rings so how much its height changes in the press can easily be seen:
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Old June 8, 2014, 07:27 PM   #3
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Thanks for the response Bart. The die is definitely making contact with the shell plate on each stroke. I went ahead and did the 1/4 inch turn as you recommended. So I re-sized about another 60 cases after this, and as I put them in my chamber checker, the ones that don't appear flush after dropping them in do pass the check IF i put some pressure on the case with my thumb. But it is a pretty tight fit obviously. My thoughts are that in an AR10 with the bolt slamming the round in the chamber it would be ok? What do you think? Thanks again for your input!!
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Old June 8, 2014, 08:20 PM   #4
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Are you sure there aren't burrs on the rims that is causing the head to sit high? I know on 223/5.56 sizing I always put them in the gage head first to make sure there aren't any burrs that give a false reading.

If the cases aren't sized with enough shoulder setback, you aren't going to shove them home with your thumb.
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Old June 9, 2014, 02:05 PM   #5
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I don't believe it was burrs on that kept them from sitting flush but I'll go back and look more closely. Great suggestion on putting them in head first, I'll do that also. Thank you for the tip
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Old June 9, 2014, 02:53 PM   #6
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Sometimes a badly stretched case will resist normal sizing. Lube and run the miscreants back into the sizing die and hold them there for a count of five, lower, rotate 1/3 turn and repeat, then do that a third, final time. I can usually take a couple more thousandths off length and maybe a quarter to a half a thousandth off diameter.

Try it. If it makes no difference, feel around each one for a burr that needs to be filed off. If that doesn't help, then set the cases up in a straight line on your table, press against the line with a ruler to even all the heads up, then sight down the row to see if the case shoulders and mouths line up well. If not, you likely have a bent rims. They can be straightened by firing in a bolt gun, assuming it has good lug contact and a true bolt face.
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Last edited by Unclenick; June 13, 2014 at 02:47 PM. Reason: typo fix
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Old June 10, 2014, 09:50 PM   #7
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Are the cases all the same make, fired with same load?
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Old June 11, 2014, 06:28 PM   #8
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Unclenick- great info thank you. I tried the 1/3 turn and hold as suggested and it appears to have helped. I took several cases that failed chamber check and tried this, some of them don't sit flush still but do with a little push of the thumbthumb. Which I couldn't do prior. I can put them through my bolt gun and see if that does anything.

Zeke- most if not all is Lake city brass. Bought a bunch of once fired brass and all I know is it was military. Visually all the cases look great
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