[Dutch14]

I've got 4 ruger barrels 2 are normal and appear as good as my aftermarket barrel. 2 have excessive and deep tool markers in them. One of the latter has a really weird chamber to rifling transition. I examined them with a bore cam. However, for 75 to 125 what can you expect from them with the way things are now.

 

[Dutch14]

As an afterthought, my aftermarket barrel shoots around .75" with cci sv and the Ruger factory barrel with the weird chamber shot an average of 1.15 last summer with cci sv. 23,500 rds ago it shot about equal to the aftermarket barrel. Looking forward to spring thaw so I can change a few things and see if the groups shrink. Groups were shot at 50 yds.

 

[Dutch14]

When hammer forged barrels are made, they start out with a rod and drill a hole in the middle all the way from one end to the other for the mandrel to fit in.. What he is likely seeing are tool marks from that operation. Two of my ruger hammer forged barrels have a spiral tool mark with a 1 turn in 2" twist. The other 2 don't have any marks.

 

[Dutch14]

My hammer forged barrels also had some marks that look like chatter marks on the lands. They eventually filled in with crud.