DiscoSteve
Hammer Time Executive member
This brass has been fired 5x, never annealed. After firing, the case headspace measures 1.633-1.635". A 1.633 fired case will chamber, but with some increase in bolt effort to close it. The bolt will close easily on a 1.631. So, I bumped the shoulder back to a nominal 1.630 to prevent any problems with chambering when hunting. Anyway, I noticed I got some "ejector" marks from just chambering a loaded round, and then removing it. Maybe I was interpreting this in the past as an ejector mark and thinking it was pressure? Does this false ejector mark mean I need to bump the shoulder back farther? Or it is something with the ejector?
Here is my brass from shooting today. 151 AH, TAC, CCI 200, COAL 2.835. Left to right in increasing powder charge. Shot about 1 MOA which is a miracle in this rifle doing a ladder.
47.0 -> 2821 fps
47.5 -> 2861
48.0 -> 2888
48.5 -> 2907
49.0 -> 2923
You can see the "ejector" mark on the unfired case. It was 47.5 gr of TAC, and coincidentally it was the only clean case neck after firing. I use a scotch brite pad to clean the necks as well as the bottom of the case to "erase" any prior ejector marks, etc. Thanks for the tip butterbean.
Here is my brass from shooting today. 151 AH, TAC, CCI 200, COAL 2.835. Left to right in increasing powder charge. Shot about 1 MOA which is a miracle in this rifle doing a ladder.
47.0 -> 2821 fps
47.5 -> 2861
48.0 -> 2888
48.5 -> 2907
49.0 -> 2923
You can see the "ejector" mark on the unfired case. It was 47.5 gr of TAC, and coincidentally it was the only clean case neck after firing. I use a scotch brite pad to clean the necks as well as the bottom of the case to "erase" any prior ejector marks, etc. Thanks for the tip butterbean.