Throat Problems Question?

[woodtick]

Hey Guys, I just finished my first barrel chambering project and I've got sort of a problem, My throat is so short that when I load the bullets to touch the riflings I get inconsistent bullet lengths due to the fact that the powder is pushing the bullet back out. Basically the rifling depth is 2.750" and I start to crush powder at 2.795" and I've got an overall magazine lenght of 2.825" is there a reamer that I can get that I can lengthen the throat to allow the bullets to be seated longer.

 

[NorCalMikie]

Have you considered going to a lighter (shorter) bullet? Once the throat wears you can't go back.

 

[Preacher]

If you decide to change it, PT&G (Dave Kiff) makes a throating reamer that will do what you want to do...

 

[Laurie]

.................... or alternatively change the powder so you don't have such heavy charge compression. Cheaper!

 

[NorCalMikie]

Once you cut that chamber, you can't go back so if it was me I'd "think on it a bit" before I did anything.

 

[woodtick]

Thankyou very much Guys, I'll give Mr. Kiff a call I've tried 3 different powders same problem and I don't want to go below a 120gr. bullet (it's a 260 ackley)

 

[Bob3700]

If you decide to go the throating reamer route, you might want to consider purchasing a reamer micro-stop. Specifically, the one that Rusty Stud manufacturers.

It will allow you to precisely control the depth that you run the reamer into the chamber. You could set up your cartridge/bullet combination for the exact lead that you desire and cut it to the that dimension.

It is a great tool.

RGDS

Bob

 

[watercam]

4-D Products has rental throaters (and reamers, go gauges, and most hand cutting gunsmithing tools for that matter). They always send good, sharp reamers that have worked for me on a number of occasions. Just GO SLOW as 1/2 a turn will cut a significant amount of throat. Google them under 'reamer rentals'.
Mike T.

 

[WayneShaw]

Kiff's Uni-Throater comes with it's own "t" handle and adjustable stop. You don't even have to do the throat in the lathe once the chamber is done.

 

[woodtick]

Very Nice!! Thanks for all the input I really appreciate it.

 

[Rustystud]

Kiffs Unit throater is a great tool but does not come with a stop. I recomend you make a rear bushing to fit the bolt race with a .4375 ID for the Unit throat driver. Make a stop and use feeler gauges or buy a micrometer adjustable stop. A word to the wise control your throating reamer depth. It will remove rifling like a hot knife in warm butter. Once it is gone it is gone. To much and a set back or barrel replacement are required.

There is a relationship to COAL and magazine capacity. Long bullets are designed to be shot single shot or in long actions.

Build your rifle with COAL in mind. Good planning will go a long ways to your shooting success. It is better to match all your components then build your rifle. Custom rifles are built with a specific purpose in mind. All around rifles are not usually well suited multiple shooting discilpines as one made for a specific purpose.

Nat Lambeth

 

[WayneShaw]

Kiff's Uni-throater does come with a stop. It comes with a t-handle, a sleeve which fits in the chamber, and brass adjustment nuts to control the depth of the cut. You can throat a barrel without taking the barrel off of the action, or use it when the barrel is in the lathe.

It does have a very fine adjustment feature.

 

[woodtick]

Thanks Wayne, I ordered the Kiff's Uni-throater and it'll be here a week or two. You guys have made a nightmare a do-able reality! Thanks for all the help.
Tick

 

[wapiti25]

AS stated GO Slow you got a lot of good advise. I've own'd a lot of rifles with throats that are too long and most of the time they don't shoot as well. You don't have a long neck in that case to work with.

 

[kentuckytroutbum]

Kiff's Uni-throater does come with a stop. It comes with a t-handle, a sleeve which fits in the chamber, and brass adjustment nuts to control the depth of the cut. You can throat a barrel without taking the barrel off of the action, or use it when the barrel is in the lathe.

It does have a very fine adjustment feature.

Wayne-

You're exactly correct. I bought one of PT&G's Uni-throater in .264 to lengthen the throat/leade on my 6.5 Grendel. Dave K. walked me through the whole process over the phone, prior to purchasing the U-T.

I was able to accurately cut the throat to achieve the desired seating depth that I wanted.

Bill

 

[woodtick]

I've got .080 to play with before I go past the magazine's overall length and if I can do half that or just a little more than half I'll solve my inconsistent seating depths and powder problems. I didn't realize this would be problem with this this short little case. It does however shoot the 107 gr MK's very well out of a thin barreled hunting rifle . Extremely low ES and SD. I just want the ability to shoot 130 class bullets. I really appreciate all your guys help.

 

[Rustystud]

I will ask Dave the next time I call him where my Uni Throater Stop is. Because the one I got from him did not come with a stop.

I made bushings for several bolt diameters that are long enough to extend past the action tang.
Then I use the MARS to measure my throat cutting.

Nat Lambeth