Originally Posted by pennytoo
I am shooting once fired cases which after fire forming have a length of 1.68" to 1.72".
I am loading Barnes VG 36 Gr. bullets in front of 26 Gr. of A2230.
I can't measure pressure but it should be at or below 50,000, based on 223 Rem data. Primers are not flattened and case heads are not expanded.
OAL is consistent with 223 Rem length, actually a bit shorter.
Thanks for your interest,
I don't have the data for the newer lot of 2230, but 28 grains in a standard .223 case should be about 48K. Are there any marks on the case OD? If so you may need to polish the chamber walls with 400 grit black paper. When you run the case thru a full length die; how much is it sized down? Should be about .003" to .005"
The case shrinkage on fire forming is normal, but in your case seems a bit excessive, and makes me wonder is the chamber is a little oversized. I would think the case should shrink in the .035" to .040" range. You are getting about .040" to .080" of shrinkage!