If it was a really nasty carbon ring, which is sounds and looks like it was, it doesn’t have anything to do with Proof or who ever chambered the barrel.
I live in one of the most liberal counties in Idaho and it’s still awesome.
Move here and vote. Bring your like minded friends and family. Idaho is going to grow. Help it grow in the right direction.
No idea where I heard it, so I might be full of shit, but I have in my head that the wind during the first third of the distance is responsible for the majority of the “wind” on the bullet. If true, the first 500 yards will be pretty useful. Or I’m full of it...
I’m really happy with my CA MPR in 6.5 PRC. Have ~500 rounds on it and and it hammers with factory 147 ELD match. Took a nice buck with it this year at 420 yards and will use it again next season.