Even for barrels that have a uniform bevel, I usually need to dress the crown to remove the slight burr that inevitably remains from the rushed production work that favors quantity over quality at worst, or “good enough” quality at best. If the bevel is uneven, take a facing cut just deep enough to remove the bevel, then use the brass screw method to establish a new bevel. Does that make any sense to anyone? I'd love to see if anyone else has experience in this realm before I get to work! It appears that the gases concentrate straight out of the bore with an 11 deg, and they seem to disperse a little wider with something like a 45 degree. I think an 11 degree would be fine for a PCP barrel like this - my big question though is how that would work with the baffled suppressor. I want to try an 11 degree, partially due to the fact that the muzzle is threaded and it would be easier to convert the current crown/chamfer to (without touching the threads). While I could spend a day chucking it in my lathe, I have good tools for hand cutting both 11 degree and 45 degree crowns, as well as 90 degree facing tool. Now, I need to make an educated decision one what I should do for the re-crowing job.
That seemed to help reduce flyers tremendously, but I was still looking at at least two uneven lands that I didn't want to try and fix with compound back then. There were also a few tiny chips in the factory chamfer that I was able to clean up around 90% with diamond paste and a rounded brass jib. I also took a tiny bit of material out of the breech with a throating reamer, and that helped improve accuracy with the slugs I shoot out with it.
I'm very happy with the polish work that I did to the bore. The accuracy has been decent for the most part, but I strongly suspect that the uneven chamfer seen on the lands under a 10x loupe (and possibly some of the chatter marks that were present) are playing a part in it not being a great barrel. I need to re-crown the factory work that was done to the choked 7.62mm LW barrel in my EDgun R5.
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