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Who neck turns their brass

 
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  #1  
Old 11-06-2012, 11:04 AM
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Who neck turns their brass

Why do you neck turn ?
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Old 11-06-2012, 12:26 PM
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Re: Who neck turns their brass

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Originally Posted by Iron Worker View Post
Why do you neck turn ?
* example #1; chamber is .222 Remington N.M. with a .246" neck. Gotta turn the necks? Not everytime as of late. I have one batch of brass that when loaded comes out to .2445" unturned. But if I use regular brass and shave the necks I can get my loads to come out around .00075" TIR rather consistently. But the proof of the pudding is group size, isn't it? Not too much difference here, and maybe .10" at the most. What I seem to have picked up on is velocity spreads. They seem to be a little tighter with the shaved necks (I already know there's no way to prove this to be true, but it's what I see on the chronograph. Not important anyway as the round goes thru a hand gun

* example #2; .223 Remington with a very tight N.M. chamber that has an actual .247" neck size. Pretty much the same results as in chamber #1. I do have some Blackhills brass that will easilly chamber after being loaded. Difference in group size is about .120" when compaired to a case that has a .242" neck and .2455" after being loaded. Both these two rounds are sized and loaded with Wilson inline dies. Cannot quite get the loaded rounds as strait as the .222, but usually see well under .001" TIR. Still not enough to stay awake at not for. Plus the barrel is junk!

* example #3; a 6mm/250AI chamber cut on the tight side, but with a minimum spec neck (about .272"/.273"). I usually shave the necks to
.2665 +/-.0025", with a loaded round comming at a tick under .270". The chamber would probably handle a .272" neck, but I think there might be some pressure problems. The rifle is a solid .275" five shot group gun. I do not load this round with Wilson dies as I've just never bothered to build a set. I get about .0015" TIR using a set of Redding .243 dies that have been reworked. On the otherhand I don't think there's much room for improvement in the chamber / die combo till I do some work on the action and stock itself

* example four; a 6mm Remington (actually two guns). Both were Ruger 77's (old style). One wouldn't shoot well (about 3.5" groups), and was rebuilt by Woods from the ground up. A new factory chamber was cut on a .38" barrel setback to factory spec'd Remington. In that mode it was a 3/4" grouping gun. I tried shaving the necks as the brass wasn't anything to write home about. and picked up almost a quarter inch in groups with the same bullets and loadings. I later got it down to .400" groups with some powder changes and very hot loads. The other rifle responded even more, and was a 5/8th's gun (had the sporter barrel) . I used three different sets of dies with these two rifles if it matters much. An RCBS standard die set, a Forster Ultra set, and a Wilson set. The Wilson die set always gave me the best groups. A further note: I really saw the greatest gains in these two rifle at 350 yards and further out as the groups seemed to be a little more consistent. My longest kill was at 670 yards with the 77V using a Berger 88 grain bullet
gary
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  #3  
Old 11-06-2012, 12:31 PM
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Re: Who neck turns their brass

It's an accuracy thing. The idea is to make the neck wall thickness consistant so the bullet will be more concentric in the chamber and enter the lands square thereby enhancing accuracy. Or something like that.
db
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Old 11-06-2012, 01:47 PM
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Re: Who neck turns their brass

outside neck turning works best the tighter the chamber. I don't see it doing a whole lot in a factory rifle with a SAAMI spec chamber. I do not own or shoot a factory rifle. Sometimes I neck turn, other times I do not. If I'm finding a rifle to be overly picky, I start turning necks and most of the time it helps.
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Old 11-06-2012, 02:31 PM
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Re: Who neck turns their brass

Well I'm shooting a 6/284 . Neck of loaded round is .275 neck of fired case is .275 plus I'm getting tough extraction and pressure signs so it must be things are too tight.
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Old 11-06-2012, 02:50 PM
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Re: Who neck turns their brass

Sounds more like the load is too hot. Reduce your load buy a couple of grains, and try again.
Db

Actually to know what is going on with your chamber, you need to cast it with Cerrosafe. That will tell you what the neck diameter of your loaded round should be. I usually am .002 to .003 under my chamber neck dia.
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Old 11-06-2012, 02:51 PM
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Re: Who neck turns their brass

I turn em just to make the neck consistent thickness, sounds like you need you need to reduce the diameter.
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