So I just got my RCBS precision Mic and my Hornady bullet comparator and headspace comparators in today.
If SAAMI minimum is 1.630 and that is where the RCBS mic is set at zero, then I found something I thought was strange.
Two bolt action rifles. I measured fired cases from both and with both the mic and the Hornady headspace gages, the fired cases measure within .001/.002 of each other across all cases in both groups from both rifles. This is the case across 30-40 total fired cases between the two rifles.
To add to this oddity, I measured the boxes of never fired factory ammo that fired cases came from, and they are SAAMI min, or -.001/-.002 under SAAMI min. The fired cases are +.001/+.002. Has anyone see fired cases only grow .002 to .004 after firing, let alone from two different rifes?
I then ran the RCBS FL sizing die, setup per instructions and it doesn't touch the shoulder.
I am going to fire two new cases, one from each rifle and confirm my measurements, but I have had this brass bagged and labeled since I fired them.
If SAAMI minimum is 1.630 and that is where the RCBS mic is set at zero, then I found something I thought was strange.
Two bolt action rifles. I measured fired cases from both and with both the mic and the Hornady headspace gages, the fired cases measure within .001/.002 of each other across all cases in both groups from both rifles. This is the case across 30-40 total fired cases between the two rifles.
To add to this oddity, I measured the boxes of never fired factory ammo that fired cases came from, and they are SAAMI min, or -.001/-.002 under SAAMI min. The fired cases are +.001/+.002. Has anyone see fired cases only grow .002 to .004 after firing, let alone from two different rifes?
I then ran the RCBS FL sizing die, setup per instructions and it doesn't touch the shoulder.
I am going to fire two new cases, one from each rifle and confirm my measurements, but I have had this brass bagged and labeled since I fired them.