30 Cal Throating Reamer Needed

[joeb33050]

I got my new 30/30 barrel yesterday and it has no throat. Is there anyone out there with a .30 throating reamer to rent? I hate to buy it for one barrel.
Thanks,
joe b.

[Double D]

Who sold you a barrel without a throat?

Why should you pay to put a throat in the barrel when you already paid for a throated bbl.  

Or did you buy the bbl as unthroated.

Or I hate to ask, but what makes you think there is no throat in your bbl. It's just not that easy to see by looking.  The real way to tell if the throat is there is to make a chamber cast and measure.

I don't know how many people have brought me there TC bbls with "no" throat.  It's just not that easy to tell by looking. Can you chamber a factory loaded round? If you can you have a throat.

[Kywoodwrkr]

joeb33050,
I have a 30 cal throat reamer with removable pilot should it become necessary for any work on your barrel.
Reamer currently has a .299  pilot if I remember correctly. Anyhooo what is normally sold for US 30 cal work.
david.petersen@eds.com
DaveP

[joeb33050]

Double D I'm pretty sure it doesn't have a throat. The rifling starts just in front of the case neck. There's no cylindrical section between the case neck and the rifling. Like there is on all my other guns/barrels. A factory round chambers, but the factory round has all of the .300 part of the bullet in the case neck. My 311299 has to be seated below the neck to go in the bbl. Also 311291, but not 31141.  "He who can't be mentioned" has responded with agreement, says he sees TC 30/30 bbls w/o throats frequently. It's not all that hard to see. There's no throat. This is a new 23" bbl from TC by way of Ed. I expected no throat, and got it. The 14" TC 30/30 bbl had no throat also.

I would like to rent the reamer from kywoodworker. I'm Joe Brennan, joeb33050@yahoo.com.
Thanks for the responses
joe b.

[Joe Kool]

Since you are shooting cast bullets, it would be best to use a throater with a 1.5 degree angle. The shallow angle will start the bullet into the rifling better a steep angle. Even if you have to buy a reamer and the drive handle from Cylmer, it would be worth it. You can always sell it on the classified forum, to recoup some of your money, after you use it.  

[Double D]

If you hold the barrel up to the light and look through the chamber and you see a sharp line where the chamber stops and the rifling starts abruptly, you have witnessed one of the famous, or is that infamous Mike B or is it Denis B this week, favorite Marketing ploys to sell you throating.  Try shining a light in from the chamber end you might see things a little better. Alway keep in  mind when dealing with him, he is a salesman.  his work is good, but he is a salesman. He has a bad rep as a businessman, but he is a salesman.

In my twenty years in the business, I have yet to find a commercial made chamber without a throat. I thought I did. I have seen many a barrel that didn't look like it had a throat.   But when the cerrosafe was poured and the casting pulled they all were throated.  I have checked quite a few TC barrels that didn't appear to have a throat and they all did.

If you understand how reamers are made and how chambering is done you will understand that the only way a barrel gets chambered without a throat is with a reamer that doesn't have a throat ground on it or a CNC program without a throat programed in.  Reamers are all made to SAAMI specs.  No Commercial maunfacturer is going to purposely make a chamber without a throat.  It's too dangerous.

The customs guys will use reamers without throats to set up chambers for some special application for their customers, such as cast bullet or long bullets.

I can also tell you from experience a chamber without a throat is almost impossible to chamber a factory round in. It can be done especially in some of the smaller older calibers.

If you have a Stoney point bullet seating depth guage you could check for a throat by putting a bullet in the case square base foward and pushing the bullet forward into the rifling.  If the base of the bullet extends beyond the mouth of the case you have a throat.  I use the Stoney point to gauge when doing special throating.

I suggest before you go to all the expense of buying or renting a reamer and possibly doing damage to your barrel do some shooting first and see if you have a problem.  Once done it can't be undone, "metal don't grow".

[joeb33050]

Well, Double D, here's what I found.
I can't see anything different lighting from the rear. I seated a jacketed bullet, Hornaday 110 gr fmj, backward in a tight case, and the assembly seated the bullet in the case to 2.153" oal. There's a radius on the base of the bullet. Max case length of a 30/30 is 2.039". 2.153"-2.039" = .114", from which must be subtracted the radius of the base and the difference between 2.039" and the chamber case length to get the true throat length. The throat is then probably less than .100", maybe as little as .050". That's as close to no throat as I can get.
The key here is that any jacketed or cast bullet must be seated very deep to go in the barrel. Again, 311299 and 311291 must be seated with the base below the neck.
I'll shoot it next week.
joe b.

[Double D]

Sticking out of the case between .100 to.050 sounds lke you have a throat!
Remember the throat isn't just a cylinder.   It is a tapered portion "bullet shaped" if you will, to lead and center up the bullet as it goes down the bore.

Now if you are going shoot Cast bullets and you don't want the base of the bullet below the neck you may need a longer throat. Shoot first and adjust later.  "Make sure it's broke before you fix it"  

I subscribe to the theory that bullet bases should not intruded into the powder chamber.  With cast bullets it just seemed to me that leading was increased with bullet bases below the neck.  But I don't extend the throat before I test fire.  

My 338/308 AI must have the 200 Gr Nosler BT base seated below the neck in order to fit the Ruger Magazine.  I did not expect great accuracy or consistancy from this load.  2 inch groups for hunting would have been acceptable.  I got 3 five shot groups averaging 1/2 inch and chrongraphed at 2496+, 2481-, 0015ES, 2486avg, 0005SD for 5 shots.  Shoots  that theory in the foot!

If you do find a need to lengthen the throat make sure the barrel gets marked with new lthroat length,  for the next guy.

Last night when I wrote my response I shined a light down from chamber  end of a TC barrel, the only thing I could tell for sure was the chamber was dirty, very dirty.  That was the only thing I could see for sure! I could not see a section .050 to .100 long .308  diameter that lead to a taper bullet long to full depth rifling

Shoot and enjoy.

[joeb33050]

DD Take a look at the clymer drawing for the 30 WCF Reamer. They're not doing it right, according to you. Note the .050" long X .310" dia CYLINDRICAL section, then the tapered at 2.5 degree section.