My Savage does that once every 10-15 rounds with reloads and factory. My reloads are on the low end of the Speer manual, and never look like that after shooting the same batch in my AR.
You don't say what bullet weight. Your powder charge is meaningless without knowing bullet weight.
Federal primers are softer cup than CCI and will flow or crater more and flatten much more.
Those primers do not look too bad really You may have a loose fitting firing pin.
I have some dandy loads that make a primer look much flatter than yours.
Primers are not the end all pressure indicator.
I never go by primer unless it is pierced and I have loaded brass to the point of piercing primers just too see what max really was for different primers.
It was a test in .223 with CCI 400 cci 450 and cci 550 primers and the CCI 400 pierced and cratered before the 550 and the 450 looked fine and dandy.
I do not condone doing it.
Those primers do not look too bad really You may have a loose fitting firing pin.
I have some dandy loads that make a primer look much flatter than yours.
Primers are not the end all pressure indicator.
I never go by primer unless it is pierced and I have loaded brass to the point of piercing primers just too see what max really was for different primers.
It was a test in .223 with CCI 400 cci 450 and cci 550 primers and the CCI 400 pierced and cratered before the 550 and the 450 looked fine and dandy.
I do not condone doing it.
95 grain Hornady SST
What I saw was when approaching maximum loads, the center round was normal looking. The other two are flattened with no rounded edges.
There is a reason that reloading manuals list what brass they are using in load development. Brass does make a difference and this is an example of it.
It's always recommended to sort brass and use the same brand when building a new load.
agreed, i'd back that load off 1gr and load up a ladder in .3gr increments, choose the one that shoots best
