Throat Depth

rockton

May 18, 2003 01:57

Anyone know an easy way to measure throat depth in a rifle cartridge?

I read of a method but do not know if it is correct.

Thanks

Rockton

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  PRZNCOP110

  May 18, 2003 02:34

  If you handload, make a dummy round and seat it out a ways. Chamber the dummy and it will hit the lands and push the bullet into the case. Eject the dummy and measure the distance from the edge of the case to the point where the lands make contact on the bullet.
  
  If the rifle is too old and the throat is too eroded, this may not work. I dont even know how accurate this method is, but it should get you close.
  
  Of course, if you dont handload you cant do it this way. I have no idea how else to do it.
  
  
  
  
  "SOCIETY PREPARES THE CRIME, THE CRIMINAL COMMITS IT"

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  bambihunter

  May 19, 2003 22:44

  I think you have the name of that old movie backwards... It's Deep Throat.
  [;)][:D][:D][:D]
  
  Sorry, I had to... Besides, PRZNCOP already answered it the best way I know.

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  PRZNCOP110

  May 19, 2003 23:12

  BH--my initial thought too, but I didnt think it would answer the question[:D]. BTW rockton, you can also make a mold of the chamber, I coundnt tell you how, but I know it can be done.
  
  
  
  
  "SOCIETY PREPARES THE CRIME, THE CRIMINAL COMMITS IT"

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  JustC

  May 20, 2003 04:44

  When you make a dummy round, take a dremel tool, with a cutter wheel atached to it, and "split" the neck of the case from the mouth down to and slightly past the shoulder. Then run this through a sizing die. Now, press the bullet into the case mouth, and then insert into the rifle and gently close the bolt. There should be enough pressure to open the bolt and remove the case with the bullet still seated in the case. Take a pocket knife, and scar the bullet right where the brass and bullet meet. Do this several times, and you should get the same result each time. Now set your seating die to touch the tip of the dummy round and your set to touch the lands. If the bullet remains in the barrel, gently tap it out with a cleaning rod. Then press the split together with your fingers until it has enough pressure to keep the bullet in it's neck when removed.
  
  If you just want a measurement, I beleive a chamber mold is the only way without having the throat reamer dimensions. You may also try contacting the manufacturer and asking them to put you through to someone in a dept that can tell you what their "specs" are or what length they shoot for on the production line. Factory rifles are notorious for long throats,.........thanks to lawyers[V]
  
  why chase the game when the bullet can get em from here?....
  Got Balistics?

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  brayhaven

  May 20, 2003 05:04

  Measurement of the throat is difficult if you're looking for a numbersince it's a tapered cut. As for seating your bullets close to the lands for accuracy, you got some good advice on that. I've also seated the "measure" dummy with the bullet in backwards to get the start of the lands.

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