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fx barrel defect

Hmmmmm, Ernst Rowe says not to rotate when you polish, let it follow the lands.
Agreed, best practice is to follow the rifling. I assume Ernest says the same nowadays but he actually did a how-to video a few years ago showing spinning the barrel in a lathe.
 
Maybe that explains the speed gain, did you happen to push a pellet or slug from the breech end out the muzzle? I’m curious how much the bore has grown in size.
before polishing I passed a slug through the barrel, the beginning was absurdly tight, in the middle there were tighter areas and others looser and in the end I couldn't pass the slug, I even had to push it in the other direction because it was already bending my rod . After polishing, it remains tight at the beginning, in the middle it became more uniform and after a lot of force I managed to pass the slug completely
 
Agreed, best practice is to follow the rifling. I assume Ernest says the same nowadays but he actually did a how-to video a few years ago showing spinning the barrel in a lathe.
Yes, he spun it at the very end of the process if my memory serves, given that the FX barrel doesn't have lands I don't see why it would matter. I've looked down my barrels after a couple of thousand rounds and a good cleaning and they are mirror smooth, I've got a bore scope coming in to verify that. I'm not sure how far down that branch of the Rabbit Hole® I want to go for a few hundred more FPS on guns that are rarely used over 30 yards. Except on ground squirrel days when it's 70 yards.
 
Yes, he spun it at the very end of the process if my memory serves, given that the FX barrel doesn't have lands I don't see why it would matter.
You're right and it was only with the finest grit, though the barrel he's demonstrating on is not an FX. Possibly one with a similarly soft rifling profile (e.g. polygonal)...I rewatched the video but he doesn't say.
 
test results today. Slug wild hogs (Brazil) 38g, reg 150/121 @ 966 fps
56m e 125m

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