Followup after the fall shoot. I went through five magazines twice - 200 rounds of assorted brands, and types. Evenly mixed, plated and lead. Some of the ammo was at least 20+ years old. I had three light primer strikes (older ammo - but still a light dent in the rim, and they fired second time around). I had no issues with FTF or FTE. I was careful loading the magazines

The barrel is very leaded, and I will be contacting SIG to see what they want to do to remedy the issue. I did a bore-scope video, just so I have something to back up my opinion.