6-5-300wby

[Hydra6]

Oh that's interesting….so as the throat degrades velocity drops off then? Is that basically from throat erosion having created some "freebore" that drops chamber pressure with equal charge weights?

That is the theory. I shoot a lot as PRS competitor. I was running a 6XC a few years ago knowing it was near end of life - at start of match I chronographed and velocity was down about 50 fps - at 600 yards I started having issues with good impacts then a flyer 2 foot away. Pulled that barrel after the match.