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Throating a rifle barrel

 
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Old 01-05-2012, 06:50 PM
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Throating a rifle barrel

Alright guys I got one for y'all! I've been reading around and have cought on to a few people cutting the throats of their barrels a little longer in order to seat vld style bullets further out in the case allowing for more powder charge in the case and so on. My question is with the throating how much is enough how much is too much or would I consult the person doing the cutting. I would still like the rounds to fit inside the magazine box.
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Old 01-06-2012, 12:13 AM
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Re: Throating a rifle barrel

Quote:
Originally Posted by Driller54 View Post
Alright guys I got one for y'all! I've been reading around and have cought on to a few people cutting the throats of their barrels a little longer in order to seat vld style bullets further out in the case allowing for more powder charge in the case and so on. My question is with the throating how much is enough how much is too much or would I consult the person doing the cutting. I would still like the rounds to fit inside the magazine box.
1 way to do it (assuming you have a competent smith) is to take your smith your rifle and a 'dummy' round seated to your desired length. Short enough to feed smoothly and long enough to maximize powder capacity. Tell him how far into or off the lands you want the bullet and he should get you close. I find .015-.020" shorter than the box mag inside dimension allows for smooth feeding.
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Old 01-06-2012, 11:23 AM
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Re: Throating a rifle barrel

Your reamer mfg can also advise. They sometimes are already familiar with certain popular cartridge/brass/bullet combos.

With a lot of hot cartridges, you'll end up chasing the throat anyways. So, you may be reducing overall effective barrel life as well as making the rifle not well suited for other bullets.

Those are just some of the possible trade-offs if you get greedy and try to optimize too much for a very specific purpose. On the other hand, you could hit a home run.

In addition to what Michael stated, your best bet is to find someone that's already had success with your desired setup and let them replicate the same specs.

-- richard
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Old 01-06-2012, 01:31 PM
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Re: Throating a rifle barrel

Some helpful hints:

1. I buy all my reamers with only .020"-.040" freebore. Then I use a piloted throating reamer to cut my throats the desired depth. I suggest no flat based bullet be seated deeper than the necjk shoulder juncture of the case. I suggest no boattail bullet be seated deaper than the rear of the bearing surface at the neck shoulder juncture of the case. Seating bullets back beyond the neck shoulder juncture only ask for trouble with fliers.

2. When using a piloted throating reamer use a mechanical stop that can be moved for ward incrementally. Throating is only removing the rifling and a sharp throating reamer can cut the rifling out like a knife in warm butter. Rewmember it is easy to remove metal but difficult to put it back.

3. Remember a throating reamer is cutting a tapered hole and lenier measurment is not the same when cutting in two different planes.

4. Aslo if you are using a dummy case with a bullet seated make sure the case is sized, trimmed, (measured to minimum spec. Be sure to chamfer and turn the necks a little. Also make sure the case is not contacting in the web area. You are want to measure off the bullet ogive.

5. clean with a brush and clean patches and air before measuring.

Nat Lambeth
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Old 01-06-2012, 09:52 PM
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Re: Throating a rifle barrel

Quote:
Originally Posted by Rustystud View Post
Some helpful hints:

Seating bullets back beyond the neck shoulder juncture only ask for trouble with fliers.


Nat Lambeth
What is you theory on this? Or facts for that matter. I mean how have so many of us fired 300 grain SMKs and Bergers out of our 338Edges with such phenominal accuracy and consistency when the boattail/bearing suface junction is WAY down past the neck/shoulder junction? Same has applied to the 208 Amax in various calibers.

Not arguing, just curious what the reasoning is.
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Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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Old 01-06-2012, 10:09 PM
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Re: Throating a rifle barrel

A lot of accuracy minded shooters don't like the bullet bearing surface rearward of the neck shoulder juncture as there can be somewhat of a 'doughnut' at that point and it does not offer the consistent neck tension of a bullet seated forward of that point.
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Old 01-06-2012, 10:17 PM
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Re: Throating a rifle barrel

Quote:
Originally Posted by msalm View Post
A lot of accuracy minded shooters don't like the bullet bearing surface rearward of the neck shoulder juncture as there can be somewhat of a 'doughnut' at that point and it does not offer the consistent neck tension of a bullet seated forward of that point.
Maybe with proper neck turning/sizing, this issue could be minimized?
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Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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