11-06-2018, 08:59 PM
I went out today with 123 sst loads with XBR8208 and an H buffer. They ranged between 27.2 and 28.5. I am happy to report that I’ve reached my velocity goal between 28.2 and 28.5. The gun feels smoother with that powder too. I’ve also located the source of my dented cases. It is coming from where the ejection port transitions to the deflector. I’m running an aero upper and it has a 90 degree squared off sharp step between the two. All my other uppers have a rounded transition. The XBR powder has also cut the denting down to a minimal amount. For now I’m happy. In the future I may take a look at smoothing out and repainting that transition to the deflector. Sorry that I can’t upload pictures.