Looking for advice on this chamber

[Hybrid284]

Hi, beginner here looking for some advice on this chamber I cut. A couple of pics from the teslong. I noticed a couple of minor scratches running length wise in the neck area, is the floating reamer holder the culprit? And i also noticed where the reamer cut the grooves in the throat area are not flat across. All of the grooves show this pattern, and my practice chambers did not. Also a shout out to the experts on this forum, your comments are appreciated and have been a big help. Thankyou, cheers Jake.

 

[Walt Krafft]

A little polish with some Scotch Brite should get rid of the scratches. The pattern in the throat is normal. Some look a lot worst depending on the type of rifling. As long as they are the same all the way around you are good.

 

[tobnpr]

All of the grooves show this pattern, and my practice chambers did not.

I don't think I'd eff with the scratches in the neck, JMO
Since you say the start of the leade has always been perfectly "clean" across the bottom edge until now, I suspect the reamer may be getting dull there. Remember, that's the most delicate part of the reamer that needs to be razor sharp to give that clean edge- and it's also the part that gets the most use/wear as it cuts from beginning to end, drill/pre-bore will reduce that wear and extend reamer life.

Just my $.02..

 

[Hybrid284]

I don't think I'd eff with the scratches in the neck, JMO
Since you say the start of the leade has always been perfectly "clean" across the bottom edge until now, I suspect the reamer may be getting dull there. Remember, that's the most delicate part of the reamer that needs to be razor sharp to give that clean edge- and it's also the part that gets the most use/wear as it cuts from beginning to end, drill/pre-bore will reduce that wear and extend reamer life.

Just my $.02..

This chamber was with a new reamer, the first cut with it. And it was with a pre bore. Thanks for the advice.

 

[DShortt]

It appears to me that the scratches were probably in the barrel beforehand. And they are insignificant. I'd not worry about them.
As for the throat not being completely flat across the grooves, that's the profile of the bore. Again, pretty insignificant. Providing this is consistent all the way around, I'd not worry about that, either.
Shoot it.
You're going to be forcing a copper jacketed piece of lead down that bore driven by several 10's of thousands of pounds of pressure. And after the first shot, it'll have fouling that the bullet is being driven over in the bore.
It won't ever look this good again.

 

[Tommie]

It appears to me that the scratches were probably in the barrel beforehand. And they are insignificant. I'd not worry about them.
As for the throat not being completely flat across the grooves, that's the profile of the bore. Again, pretty insignificant. Providing this is consistent all the way around, I'd not worry about that, either.
Shoot it.
You're going to be forcing a copper jacketed piece of lead down that bore driven by several 10's of thousands of pounds of pressure. And after the first shot, it'll have fouling that the bullet is being driven over in the bore.
It won't ever look this good again.

Agreed. Mostly what I’m seeing looks like button chatter from the barrel manufacturer. Seems that bore scopes have shattered our fantasies of perfect bores and chambers. Either way, it’s time to shoot.

 

[Judd]

Just wait until you get one of those buttoned barrels where the center isn’t as tall as the edges…I had no idea how I had screwed that up They look like a U. What you’re looking for is that they all look identical. By and large, the rest…we don’t control.

 

[BuffaloBill]

I’m far from an expert having only chambered 7 myself. But the satisfaction that came from that first one shooting tiny groups was huge. I bet your’s will too. This is a highly addictive and rewarding hobby!

 

[tobnpr]

Just wait until you get one of those buttoned barrels where the center isn’t as tall as the edges…I had no idea how I had screwed that up They look like a U. What you’re looking for is that they all look identical. By and large, the rest…we don’t control.

Like this?




Groove radius is larger than nominal, this is what causes the "half moon". Perfectly cut/concentric chamber, it's not a defect from the process.

 

[Judd]

Exactly like your drawing @tobnpr, it was so weird I took that one to my mentor and was like WTH did I do wrong here. He started laughing and said “you haven’t done enough button barrels yet, kid”

Funny, it’s a Benchmark 6.5 that is a saum and it hammers, especially for a 16” hunting rifle.

I’ve had one exactly like your picture too…that’s where the center is higher. It shot too.

 

[X Count]

If I get a chance I'll post some photos of a cracker button barrel.