I need to neck turn my resized 6.5 Grendel brass for 22 ARC. The fired brass did not fully expand to let a bullet fall thru a freshly fired brass cartridge. I had 3.5 thou of neck tension. I looks like I got about 1.5 thou of neck expansion. The Grendel brass has a neck thickness of about 15 thou compared to the Factory thickness of 11 thou. Do you think turning the neck down to 13 thou is enough. I just feel 11 thou is a bit thin to hold good tension.
