Brand new barrel, am I being Anal?

[oley55]

Brand new barrel out of bubble wrap with a single dry patch carefully run through it from breach to muzzle. Looking at the crown under magnification I am seeing some minor distortion on just one of the lands/grooves. The other lands/grooves are clean cut. Tried to post pics comparing clean sharp edges vs jagged edges.

This is a hand lapped barrel, could this have happened during the hand lapping and should I consider having the crown cleaned up or am I being anal?

 

[okie]

send it to me for inspection....

 

[oley55]

a couple more pics using iPhone.

 

[DaveTooley]

The universal test for a crown. Does it catch on a Q-Tip. If it doesn't pull a thread shoot it. If it does then it's a matter of how many. Crowns aren't as important as many think. Of course they should be properly executed regardless.

 

[Zero333]

Looks awesome to me.

 

[284winner]

Brand new barrel out of bubble wrap with a single dry patch carefully run through it from breach to muzzle. Looking at the crown under magnification I am seeing some minor distortion on just one of the lands/grooves. The other lands/grooves are clean cut. Tried to post pics comparing clean sharp edges with jagged edges.

This is a hand lapped barrel, could this have happened during the hand lapping and should I consider having the crown cleaned up or am I being anal?
View attachment 1195071 View attachment 1195072 View attachment 1195073 View attachment 1195074

Give it the Q-tip test. If no snags, shoot it. Re-crowning is not a big job and can easily be done after the rifle is finished.

 

[msinc]

.......Crowns aren't as important as many think.........

I find the opposite to be true. The rifling at the crown is very important because it is the last thing to touch the bullet before it is sent on it's way, as compared to say rifling just past the throat area. The bullet has more rifling ahead to stabilize it and straighten it out before it leaves. There is nothing to help it out once it leaves the muzzle if the crown is not right. Still don't think so??? Gunch up the rifling at the crown and see how she shoots now!!
Since this is a "new" unchambered and unfitted barrel you always cut at least an inch off the muzzle before crowning it, especially with a hand lapped bore. Once done, it should be fine. I have had a few I had to cut more. You will know when you shoot it. Best of luck and good shooting.

Edit: I should add that the barrel I once had to cut almost 2 inches off of had no visible defects that could be identified with a Hawkeye borescope.

 

[Dub]

i would be concerned, but I would shoot it before any other action.

 

[oley55]

I guess I should have mentioned this barrel is pre-fit for a Savage 10, and would normally be installed as received. I did send some pics off to the barrel supplier who I presume will forward to the manufacturer if he deems it appropriate.

 

[expiper]

that is terrible work,,,it looks like it was done on a pipe machine,,,but,,,the gouge while threading for muzzle brake is far enuff from the rifleing that it may NOT cause any problems ,,,I like that area to be sharp enuff to take a little burr off your finger nail when rubed there,,,Roger

 

[284winner]

Shoot it. That'll tell the story. Many many factory barrels look much worse and shoot unbelievably well. Doesn't justify the looks of the imperfections but also doesn't mean that it won't shoot good. Don't concern yourself till it doesn't shoot. Then have it re-crowned and start over.

 

[oley55]

that is terrible work,,,it looks like it was done on a pipe machine,,,but,,,the gouge while threading for muzzle brake is far enuff from the rifleing that it may NOT cause any problems ,,,I like that area to be sharp enuff to take a little burr off your finger nail when rubed there,,,Roger

Roger, not sure what you are referring to, my area of concern is the ragged edge of the bore.

 

[Ranger188]

It looks like the tooling was on it's last leg, not very clean.
You already noted it to whom you bought it from.
Tell them you would like to shoot some thru it, if that's OK.
You don't want them to say you can't send it back now.

 

[searcher]

I'd shoot it and look at the crown with a magnifying glass. Look at the carbon pattern around the perimeter outside the bore. It should be an even, balanced pattern. Your crown shows signs of a rough edge. That is, in itself, not necessarily an accuracy killer. What hurts is the the bore opening not being square to the bore or any significant scratches into the crown, should that be the case. I don't see any bad scratches in the photos. You can buy a tool to re-hone the crown yourself for maybe less than you pay someone else if you have to ship the rifle something I'd prefer to do myself unless I trusted the smith doing it and I didn't have to ship it. If the carbon pattern looks good - I'd do nothing unless accuracy makes you suspect something is wrong.

 

[jackieschmidt]

I assume you are referring to the fourth picture in your initial post.

it doesn’t look good. But then I am pretty anal when it comes to crowns.

By the way, barrels are lapped before they are cut to length, so that is not the culprit.

 

[oley55]

I assume you are referring to the fourth picture in your initial post.

it doesn’t look good. But then I am pretty anal when it comes to crowns.

By the way, barrels are lapped before they are cut to length, so that is not the culprit.

The 2nd and 4th are borescope pics of the same land/groove area, but taken from differing directions (entering bore via the muzzle vs entering via the breach). The angle of the cheapo Teslong borescope mirror and lights give significantly different views depending on position and direction.

Except for this crown issue the bore and chamber look fantastic to me. But then again, my basis for judgement is your average factory barrel.

 

[B Nettesheim]

It was cut with a dull tool only way to make it look better is to recut it with a sharp one

 

[DaveTooley]

Here's a problem with The Teslong bore scopes. We can see minute variations in the surface texture of the barrel anywhere a tool touches it. Barrels aren't as smooth as everyone thinks. Some of the rough edge is just the surface finish and highlighted by cutting the crown. I don't do it any longer but a few seconds polishing the crown would make most of that disappear.

 

[DaveTooley]

I find the opposite to be true. The rifling at the crown is very important because it is the last thing to touch the bullet before it is sent on it's way, as compared to say rifling just past the throat area. The bullet has more rifling ahead to stabilize it and straighten it out before it leaves. There is nothing to help it out once it leaves the muzzle if the crown is not right. Still don't think so??? Gunch up the rifling at the crown and see how she shoots now!!
Since this is a "new" unchambered and unfitted barrel you always cut at least an inch off the muzzle before crowning it, especially with a hand lapped bore. Once done, it should be fine. I have had a few I had to cut more. You will know when you shoot it. Best of luck and good shooting.

Edit: I should add that the barrel I once had to cut almost 2 inches off of had no visible defects that could be identified with a Hawkeye borescope.

This one isn't "gunched up". The execution seems fine although it appears to have an odd angle and has a rough edge at the transition to the bore. I'd be curious to see what it looked like after you cleaned it with a bronze brush. I've lambasted manufactures for stuff I saw that then disappeared with a good cleaning.

 

[DaveTooley]

We need the Q-tip test. We have no depth perception so we don't know if there is any raised metal.