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Resizing cases "minimally," however, doesn't necessarily mean neck-sizing. I've fooled around with neck-sizing quite a bit over the years, and find the practice normally produces less accurate ammunition.

Why? The body of the typical factory neck-sizing die is much larger than the case body, so there's nothing to hold the case in alignment with the neck-sizing portion of the die. Consequently the neck's often resized out of alignment with the case body, a condition often made worse when the case gets pulled back over the expander ball.
-from Factors In Accuracy, Part II: Handloads
by John Barsness
 

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yukon375 said:
The body of the typical factory neck-sizing die is much larger than the case body, so there's nothing to hold the case in alignment with the neck-sizing portion of the die. Consequently the neck's often resized out of alignment with the case body, a condition often made worse when the case gets pulled back over the expander ball.
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That is exactly why most benchrest shooters always F/L size. Accuracy improves.
 

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I usually neck size until my case's start to get tight. When they start to get tight then I run them through the FL sizer. I always check my case's in the rifle that they will be fired in after sizing.

Some people say that FL sizing shortens case life, I have never found this to be true. I have also never found FL vs NS making any difference in accuracy in most rifles. There are just to many variables in factory rifles and dies and how they are set to say that one way in more accurate and gives better case life then the other.

Good luck, Tony
 

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stoolshooter said:
yukon375 said:
The body of the typical factory neck-sizing die is much larger than the case body, so there's nothing to hold the case in alignment with the neck-sizing portion of the die. Consequently the neck's often resized out of alignment with the case body, a condition often made worse when the case gets pulled back over the expander ball.
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That is exactly why most benchrest shooters always F/L size. Accuracy improves.
Not sure where you got this info from. I have never, and never seen anyone else FL size their cases at a BR match. Most BR competitors use in-line hand dies that use a bushing that is sized to the chamber/case that only sizes the neck. The dies for my BR rifle were cut with the same reamer as the rifles chamber, then the neck area was removed to accept the bushings. This allows almost perfect alignment when neck sizing, something almost impossible to do with threaded dies and press.

Good luck, Tony
 

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Buy Bushing dies.You can set up a bushing die to size however much of the neck you want and still resize the body. I always use this method in my benchrest guns. The die is set up to bump the shoulder back between a .001" and .0015", that ensures me everytime I run a case into the chamber the bolt closes easy, I keep the bushing set so that it resizes about half the neck. This has produced some crazy accurate loads.

In my factory chambers I like to neck size only, when the bolt starts closing hard I have a body die set up to bump the shoulder back. I don't have bushing dies for these chambers, someday maybe I'll replace them. This also has given me great results in accuracy.
 

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Factory chambers are to sloppy to use benchrest dies or even the word benchrest with... .007- and more per side is too much of a gap to try and do something with.. you want to see how much it is... size half of your neck and look at it..you'll be amazed that there's that much gap.. size it about a 1/3 of the neck and seat the bullet about at the bottom of the sized part..it'll shoot it's best groups ever and that's a promise.. use IMR 4064 and some 50 grain V-maxes and tell us what happens.
 

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here is a pic of what dasher is talking about, factory 243 chamber neck sized with a RCBS Standard die



The same thing can be accomplished with a Bushing Die; the benefit is you can set the neck tension where you want it by changing bushings
 

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Tony300wby said:
I usually neck size until my case's start to get tight. When they start to get tight then I run them through the FL sizer. I always check my case's in the rifle that they will be fired in after sizing.

Some people say that FL sizing shortens case life, I have never found this to be true. I have also never found FL vs NS making any difference in accuracy in most rifles. There are just to many variables in factory rifles and dies and how they are set to say that one way in more accurate and gives better case life then the other.

Good luck, Tony
Exactly my views on everything! Neck size until the bolt gets hard to cycle then fl size ( and always try cycle them in the rifle as well). I too never seen much of a difference between the two. As of late I have just been FL resizing everything, you really Can't argue with John Barsness!
 

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Fl size everything that is not fired from your rifle. Neck if there are dents in the neck.

I Fl size everything no matter what, keeps the cases on the straight and straight.
 
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