Cayugad,
I was pretty happy my 1st time out using Pinnacle, but my 2nd shooting session sure soured me.
I didn't mention that I had to clean between shots that day. I was getting just about the same amount of fouling as youdo shooting 777 wo the crud ring.
When I removed the breech plug at the end of the day, there was a tar like substance inside the breech.
I hope that this was a fluke, but I'm afraid this stuff attracts the moisture in the air.As they say..."time will tell"