Blemished Lands

[59FLH]

Can anyone tell what most likely caused these blemishes? AFAIK the only thing down this barrel is the riffling button, the mfg tools, a Grizzly rod, a few bullets and a cleaning jag & patches. They are aprox 1.25" from the muzzle, on all lands. I am getting ready to recut the crown and I am considering shortening the barrel. It does not shoot very well but I am suspect of the stock to action fit. This barrel had the recommended 1.5" cut from the muzzle end of the blank.

With the exceptions of these marks the rifling looks excellent. I am not sure I looked, but never noticed them before.

 

[tac284]

Possibly caused by the bushing on the grizzly rod?

 

[Ggmac]

Did you use any kind of expandable arbor ?

 

[gme]

looks like the damage occurred after rifling, if it were mine I'd have a talk with the barrel maker and get their input, if they think it's their fault they'll replace it, if not, cut it

 

[AlNyhus]

I've seen that before when an expanding arbor bore sighter was used. -Al

 

[Uncle Bruce]

I've seen that before when an expanding arbor bore sighter was used. -Al

Was the muzzle cut with a single cut bit or a piloted 11 deg. Tool?
It looks like a pilot tool mark

 

[Ziabeam]

Can anyone tell what most likely caused these blemishes? AFAIK the only thing down this barrel is the riffling button, the mfg tools, a Grizzly rod, a few bullets and a cleaning jag & patches. They are aprox 1.25" from the muzzle, on all lands. I am getting ready to recut the crown and I am considering shortening the barrel. It does not shoot very well but I am suspect of the stock to action fit. This barrel had the recommended 1.5" cut from the muzzle end of the blank.

With the exceptions of these marks the rifling looks excellent. I am not sure I looked, but never noticed them If that barrel

Very very common blemish. If that is a barrel from a mass production commercial firearm, dollars to donuts they used a piloted crowning tool to cut corners on production. It’s one of the first things I look for when bore scoping a barrel. I use to work at Freedom Arms building revolvers, and argued against piloted reamers for that reason. Dick Casull concurred, eloquently stating “you gotta lay your nut-sack on the lathe ways when crowning a barrel”.

Edit; Also agree it could be from improper use of a bore sighting mandrel, as previously mentioned.