5R runout demonstrated

[Dusty Stevens]

All the button people I know coat/plate the bore before pulling/pushing the button. Probably the secretive part of the trade is the lube. I know one manufacture had a copper infused lube.

No telling how many people panicked when they looked in a barrel and seen the copper plating. You can see it from the muzzle and looks real used

 

[LVLAaron]

No telling how many people panicked when they looked in a barrel and seen the copper plating. You can see it from the muzzle and looks real used

I saw and wondered about that on a savage prefit barrel I had some time ago. I figured it was from a proof shot or something... didn't think about it, but interesting nonetheless

 

[Dusty Stevens]

I saw and wondered about that on a savage prefit barrel I had some time ago. I figured it was from a proof shot or something... didn't think about it, but interesting nonetheless

They call it a copper wash. It comes right out like with butchs but it looks pretty scary to a guy that thinks you screwed him on a new barrel

 

[Sniperhandle]

It's not a headstock issue. It wasn't cut on my machine and I can promise you, it wasn't the headstock. The phenomenon has been described but I hacked together a visual.



Red line through the middle is one opposite set of flues on a 6 flute reamer.

One flute hits point A to make a cut. The ramp in the flute, coupled with an unsupported oppsite side (B) can flex/push/force the reamer into the B section. The further along you get, the more gets eaten away where B is, making it easier to push the cutting further into B. Another impact to the mess, is the ramped nature of the lead. You're pushing the reamer into and up that ramp... more force on the unsupported side.

On a standard 4/6 land barrel, the reamer is always equally cutting and supported on opposite sides.



View attachment 1365179

After thinking this over for a few days, The pilot is always engaged in the rifling ahead of all of the cutting keeping everything centered, So according to this pic, Your pilot is supported by 5 lands and if you chose the tightest pilot available, Why are we worried about this? The body of the reamer is not cutting any area that is rifled, Only the front section behind the pilot is cutting rifling? I have never had a problem and hadn't even considered there being a problem until now.

 

[Dusty Stevens]

After thinking this over for a few days, The pilot is always engaged in the rifling ahead of all of the cutting keeping everything centered, So according to this pic, Your pilot is supported by 5 lands and if you chose the tightest pilot available, Why are we worried about this? The body of the reamer is not cutting any area that is rifled, Only the front section behind the pilot is cutting rifling? I have never had a problem and hadn't even considered there being a problem until now.

The pilot is not engaged- the same as a bullet. Its the theory behind a 5r overall. Nothing opposite of the bullet. The bigger the bore the worse it is. Its never an issue until it is. Once it is you cant stop it

 

[tobnpr]

Why not a 5R rifled pilot... ?

 

[Sniperhandle]

The pilot is not engaged- the same as a bullet. Its the theory behind a 5r overall. Nothing opposite of the bullet. The bigger the bore the worse it is. Its never an issue until it is. Once it is you cant stop it

I would still think the pilot is engaged at 3 points like a triangle?

 

[LVLAaron]

Yes, but.... The pilot isn't perfectly tight in the bore or on the reamer. Once it starts cutting a little bit of a pentagon, it starts to get away from you, and will flex the reamer, pilot or not. Steel is a lot softer than we give it credit for.

 

[Sniperhandle]

Yes, but.... The pilot isn't perfectly tight in the bore or on the reamer. Once it starts cutting a little bit of a pentagon, it starts to get away from you, and will flex the reamer, pilot or not. Steel is a lot softer than we give it credit for.

Ok, I give up, I'm not going to sweat it till I do!

 

[Dusty Stevens]

Ok, I give up, I'm not going to sweat it till I do!

Its not a problem til it is