Page Index Toggle Pages: 1 Send TopicPrint
Normal Topic throating a chamber (Read 4603 times)
Hank45
Oldtimer
*****
Offline


Beer is living proof that
GOD loves you

Posts: 506
Location: MA
Joined: Jan 21st, 2010
throating a chamber
Sep 6th, 2010 at 8:42am
Print Post  
I was thinking of having a barrel throated that is  already rifled, can this be done and does accuracy suffer? Thanks Hank45
  
Back to top
 
IP Logged
 
40_Rod
Frequent Elocutionist
*****
Offline


Extremism in the persuit
of accuracy is not a
vice

Posts: 4285
Location: Knoxville, TN
Joined: Apr 20th, 2004
Re: throating a chamber
Reply #1 - Sep 6th, 2010 at 9:09am
Print Post  
For breach- seat throats a separate throating reamer is almost always used. 

40 Rod
  
Back to top
 
IP Logged
 
John Taylor
Frequent Elocutionist
*****
Offline



Posts: 1851
Location: Lewiston, ID
Joined: Oct 23rd, 2006
Re: throating a chamber
Reply #2 - Sep 6th, 2010 at 9:56am
Print Post  
You can get throating reamers at (You need to Login or Register to view media files and links)
  

John Taylor   Machinist/gunsmith
Back to top
WWW  
IP Logged
 
Quarter_Bore
Oldtimer
*****
Offline



Posts: 817
Location:   
Joined: Dec 16th, 2005
Re: throating a chamber
Reply #3 - Sep 6th, 2010 at 11:45am
Print Post  
Throating is never a good idea if it is a 100 year old rifle. You can get the same effect by getting a custom bullet mold that is either 2 diameter or tapered. If it's a new barrel-who cares. Go for it. Smiley
  
Back to top
 
IP Logged
 
Idaho Sharpshooter
Full Member
***
Offline



Posts: 192
Location: Nampa, Idaho
Joined: Jan 17th, 2007
Re: throating a chamber
Reply #4 - Sep 9th, 2010 at 3:09am
Print Post  
I wonder...

Why would you need to throat a chamber?  I was told that you use a slightly oversize bullet and mechanically seat it with the breech seater.
When Dean Miller built my rifle, he also had Doc Brewer make dies for the Blackmon swaging press.  Doc had me seat half a dozen bullets and then ease them back out with a cleaning rod.  The die reshaped the Barnett Mould bullets about 1/2 a thousandth over throat dimensions for that slight interference fit.

Would it not be easier to just make the mould just slightly over groove diameter?  I am curious.

Rich
  
Back to top
 
IP Logged
 
QuestionableMaynard8130
Frequent Elocutionist
*****
Offline



Posts: 4144
Location: Benton  Harbor MI
Joined: Apr 17th, 2004
Re: throating a chamber
Reply #5 - Sep 10th, 2010 at 6:13am
Print Post  
I think that it'd depend a whole lot on the way the original is set up and how you are going to shoot it.  start with a good chamber cast and see what you actually have before doing anything.
As I understand it.  The point to "throating" is to break the angle of transition very slightly ease the effort to seat a bullet into the rifling if it is loaded long or breech-seated.
With mechanical seaters, soft alloys, tapered cast bullets I have a hard time imagining a need.
However if you are shooting jacketed or real hard cast bullets for higher velocity and shooting fixed ammo I can see where you might want to consider it.  (Even with hard alloys a change in mould configuration and/or a longer lever on a breech-seater might solve the problem)
As Ken says, you do NOT want to mess up a quality antique gun when an alloy change or a better fitting mold will do the trick
  

sacred cows make the best burger
Back to top
 
IP Logged
 
38_Cal
Frequent Elocutionist
*****
Offline



Posts: 2255
Location: Montezuma, Iowa
Joined: Apr 27th, 2005
Re: throating a chamber
Reply #6 - Sep 11th, 2010 at 10:10am
Print Post  
The original Browning B-78 rifles would not accept many jacketed bullet reloads and most heavy bullet cast reloads at nominal overall lengths due to the throat configuration.  I probably did about a dozen or so in the early 1980's when working for a shop in the SF Bay Area.

David
  

David Kaiser
Montezuma, IA
Back to top
 
IP Logged
 
Page Index Toggle Pages: 1
Send TopicPrint