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Advise on Bushing Dies Please

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  #8  
Unread 06-07-2009, 01:53 PM
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Re: Advise on Bushing Dies Please

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Originally Posted by woods View Post
IMO the bushing dies are not as useful unless you outside neck turn. If you leave the expander ball in then you might as well be using a cheaper full length die. The bushing will size the neck smaller just like a full length die and then the expander will expand the neck back out to the size of the expander ball. It wouldn't matter what size bushing you got because the expander is going to determine the inside dimensions of the neck.

If you neck turn your brass to a consistant thickness and use the bushing die without the expander then you are in control.
Agree, I neck size only with Redding bushing style neck sizing dies, but I also outside neck turn case necks to a uniform dimension. This is the only way to get uniform necks and neck tension with the neck bushing dies that I'm aware of.
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  #9  
Unread 06-07-2009, 08:54 PM
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Re: Advise on Bushing Dies Please

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Originally Posted by MontanaRifleman View Post
Thanks for the input guys. I have never used a bushing die and I am still trying to wrap my head around the concept. It obviously allows you to adjust neck tension. The way I understood the mechanics of a neck sizer before was that the expander button went down through the ncek, and the the neck die squeezed the neck the a slight less diameter than the expander button which would open it up to the correct "inside" diameter to seat the bullet. With the bushing style sizer it seems that the expander button plays no role?

Measuring my Rem factory ammo, the neck OD measures ~ .3375. I plan on turning the necks just enough to remove the high spots. Right now their thickness measures ~ .017-.018, so hopefully I wont be removing more than .001 of material.

When I measure my 300 WSM before seating and after seating 180 E-Tips. It measures .336 before and .338 after, so .002 tension? This seems to work very well with these bullets as far as grip. They seat smoothly and hold well.

Soooo... I'm guessing I need a .335 bushing??? Any comments?
What I would suggest is that you take a random sample of 10 to 15 cases, turn the necks to find out how much you will have to take off to clean them to your satisfaction. That will be you neck thickness for that batch of brass. Load a bullet (no primer no powder) into say 4 of the them, mic the LOADED neck diameter and the order both .002 and .003 smaller bushings. I would order the set that has the "Type "S" neck sizing die, a body die, and the seating die of your preference, and DO NOT use the expander ball.
Dave
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  #10  
Unread 06-07-2009, 09:25 PM
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Re: Advise on Bushing Dies Please

Thanks again for the input guys. Much appreciated. I dont have any 300 RUM dies to to size the neck for turning. I do have a 300 WSM neck die and actually ran a 300 RUM case through it to get a nice round neck and it worked pretty good. I will turn one of these necks and get the OD and then order the bushing that is equal in diameter which "should" get me about .002 tension. If it's not enough tension, then I'll order another one.

How far down the necks should I turn them? I'm thinking about .050 within the junction of the shoulder. I was planning to size to leave a doughnut at the bottom of the neck to center the case into the chamber.

Dirtball, I am planning to get the set you described, seems like the way to go to me.

Will also be getting the TN bushing, what's another $10?

-MR
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  #11  
Unread 06-07-2009, 09:52 PM
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Re: Advise on Bushing Dies Please

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Originally Posted by MontanaRifleman View Post
How far down the necks should I turn them? I'm thinking about .050 within the junction of the shoulder. I was planning to size to leave a doughnut at the bottom of the neck to center the case into the chamber.

-MR
Forster recommends that you turn a little INTO the shoulder


to mitigate development of an internal do-nut



Whether that works or not is up for grabs but IMO it would not be adviseable to turn only part of the neck. What you seem to want to accomplish is to leave part of the neck fire formed size


You can do that by setting your die correctly whether the brass was thicker there or not. Leaving part of the neck unturned and thicker can lead to problems trying to set the die to size down to that exact point. Also if you decide later to size without leaving the external do-nut then you would have another problem.
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  #12  
Unread 06-07-2009, 10:55 PM
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Re: Advise on Bushing Dies Please

Great illustrations woods. That's exactly what I do. Outside neck turn slightly back into the shoulder in order to mitigate the formation of a thickened ring/doughut at the base of the case neck.
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