Downright nasty for shooting groups today ... -15C so I cut right to the chase and shot a group with some 4X fired brass loaded to my accuracy sweet spot for other 6 Dashers. Voila' no cratering, no stiff bolt, nice rounded corners on the primer. Thanks to HW223 for suggesting it could be a brass issue, rather than over pressure.
He is right.
I would be interested to know theories why the cratering occurred with the 10X fired brass.
No chrony today...too cold.
.
Sent from my iPad using Tapatalk