What are these Pointy things at the bore/chamber junction? >>>Edit added information

[hoz53]

Its weird that the neck doesnt even clean up the grooves like its the wrong caliber barrel or something.

Yeah this is what I’m wondering. It does look the same all the way around.
Thanks

 

[hoz53]

Almost looks like the freebore diameter on the reamer barely cut or the reamer was flopping around some. Proper bushing?(can of worms could be opened on the bushing usage debate) Barrel MFG? Could be the bore isn't round too. Kinda hard to tell from just that one pic..

I’ve added info to the original post. This reamer seems to do that on all barrels. thanks for the good info

 

[hoz53]

Do those pointy things line right up with the lands? From the pic, it looks like the lands are tapered down. Is that even possible?

They line up with the grooves. Reamer has done this with another barrel so I don’t think it’s a tapered bore. Thanks

 

[hoz53]

How many grooves does that barrel have?

I though I counted 6 but will recheck tomorrow. Thanks

 

[hoz53]

Barrel? Reamer specs?

I’ve added this info to original post Dave. I hope I got it all. Thanks

 

[hoz53]

From the the above picture it looks like a button barrel and the reamers has no free bore.

It’s a button barrel and the reamer has free bore. I have included a print in the original post. Thanks

 

[hoz53]

Ok i looked some more.
X is groove, O is land.
The pointy things seem to be a tapering off of WTHeck is that???
Oh and the scratch, crank reamer in after the fact to re measure because i forgot how far it went?
View attachment 1188187

I’ve included a pic in original post that shows the line to the point goes all the way down the chamber and of coarse there are the lines lining up with each groove. It’s the first pic in the post- as you see I cut that chamber off and redid it. Still the pointy things at that point in barrel but not as long.
Thanks

 

[DaveTooley]

Button rifled barrel of lessor quality usually means they are at the very least unique and varied. Radius in the groove and on top of the lands may not meet the spec. Also they may vary in a single groove, as in wavy. I've seen it for years. Even in the best button and cut rifled barrels you can see it but we're talking in millionths of an inch in those barrels and it doesn't affect anything. The main thing is uniformity.

 

[Alex Wheeler]

Your set back got the throat up into a groove thats tighter and now your seeing the whole pattern. Like Dave said, buttons can have all kinds of geometry in them. Not usually as much as this one though.

 

[Spotshooter]

How many flutes not the reamer vs. the number of lands ?

 

[Shawnba67]

How did the other 3 barrels/chambers shoot?

 

[hoz53]

How did the other 3 barrels/chambers shoot?

its only been two barrels. I cut both off once before shooting and rechambered. one is a used barrel i made into an ar15 barrel so i cant expect alot out of it and i havent installed it on an upper yet. the other is this barrel, so havent shot any of them yet.

 

[hoz53]

Your set back got the throat up into a groove thats tighter and now your seeing the whole pattern. Like Dave said, buttons can have all kinds of geometry in them. Not usually as much as this one though.

Thanks Alex - I sure learned some things and Ill only be asking questions about better quality barrels from now on.

 

[hoz53]

Button rifled barrel of lessor quality usually means they are at the very least unique and varied. Radius in the groove and on top of the lands may not meet the spec. Also they may vary in a single groove, as in wavy. I've seen it for years. Even in the best button and cut rifled barrels you can see it but we're talking in millionths of an inch in those barrels and it doesn't affect anything. The main thing is uniformity.

Thats alot of good info Dave. I thought I was doing something wrong. Ill be sure to use the best barrels I can from now on. Thank You

 

[PWS]

Thats alot of good info Dave. I thought I was doing something wrong. Ill be sure to use the best barrels I can from now on. Thank You

Ditto what Dave says. I've seen it in a few Wilson barrels fitted to sporters and, so far, they've all proven capable of producing their share of 1moa groups. Don't know if I'd want to see that in a top dollar barrel however...

 

[hoz53]

Ditto what Dave says. I've seen it in a few Wilson barrels fitted to sporters and, so far, they've all proven capable of producing their share of 1moa groups. Don't know if I'd want to see that in a top dollar barrel however...

thanks for the support AWS