CONGRATS! strycnine
A couple of weekends ago I ran my first 400 rounds or so of both super & sub-sonic through my build...ran out of ammo before I ran out of fun
Those primer strikes look pretty good to me.
Have fun with your SBR and keep us posted.
I am off to my ManCave, finishing up more loads and going shooting with my .300 Whisper tomorrow.
Keep The High Ground,
G