Re: sps tactical flattening primers
Right on, dont worry about the crater. My sps craters subsonics. It also craters primed cases I bet lol. Just the way the firing pin and bolt is. No big deal really. I have put several thousand rounds through the rifle. Accuracy is great, not issues whatsoever. Hell, the mark makes it easy to keep the brass for the bolt gun separate from the gasser lol.
No pierced primers or anything here.
IF you really want to, bush the bolt, but honestly I'd not sweat it if it is working well.
As far as flattened primers, I still see nice rounded edges on those primers, so I'd say keep shooting. No flats there.