300WM Vanguard/Benchmark Barrel, I think I found it!!

Hmm... good to know about benchmark.

I had my Steyr re-bored and chambered a few years ago (Ron Smith in wimborne AB), after talking with him regarding button versus cut rifling and how the button rifling process essentially deforms the metal, and more so at the narrower muzzle end, and then getting my head around how gain twist has a less restrictive (slower twist) initially that would usually handle a hotter load and then gains rotational velocity while sealing the rifling cut on the projectile as it tightens up slightly over the length I was completely sold on gain twist cut rifling.

Not sure if Ron is still doing work but I think his son and maybe grandchildren are working there, I think he’s in his late 80’s now.
 
Well got my scope in and wasn't able to capture the defects like I did from the end view of the barrel, it's just to bright and too much in line with the rifling direction to show.

Here is what I was able to capture...

Just some marks on the lands.Probably superficial.Again, just inside the muzzle.







I did look at the throat and didn't particularly like this...

Maybe this is normal.About 200-250 rounds through.

Transition to the rifling looked very good, no deposits or burrs or anything that caught my eye.

 
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