School me on neck turning.

[Darkside-Six]

Is it worth it? I’ve always I’ve always just written at off as not having too much of an impact or not being needed but lately I’ve been dabbling at looking into it. I shoot quality brass (Lapua) in .308 & 6.5 CM.

For those that do turn necks, how often do you do it and what are the outcomes?

 

[spife7980]

With lapua brass it will only remove about .001 so no, I wouldn’t bother. If you were using crap Winchester that can vary by .003 from one side of the case to the other there is some merit to it. But for a field rifle in a no turn chamber it would be a waste of time imo.

You only need to turn 1x unless enough of the shoulder migrated into the neck with many firings of the brass and even then it’s really only an issue with a tight necked chamber.

 

[ZiaHunter]

I neck turn during initial case prep. Important to to trim the necks to the same length since most neck turning tools index off the case mouth. I trim with a Giraud trimmer since it indexes off the shoulder to give consistent neck length. You want to have the cutter cut slightly into the shoulder/neck junction. Expand with a mandrel matched with the turning arbor prior to turning and prefer carbide arbors. I turn to get a consistent neck wall thickness all around the neck and measure with a precision tube micrometer. Lapua brass is pretty uniform but still turn for my F/O rifles. Accurate Shooter has some good articles on neck turning.

 

[_Raining]

I neck turn during initial case prep. Important to to trim the necks to the same length since most neck turning tools index off the case mouth. I trim with a Giraud trimmer since it indexes off the shoulder to give consistent neck length. You want to have the cutter cut slightly into the shoulder/neck junction. Expand with a mandrel matched with the turning arbor prior to turning and prefer carbide arbors. I turn to get a consistent neck wall thickness all around the neck and measure with a precision tube micrometer. Lapua brass is pretty uniform but still turn for my F/O rifles. Accurate Shooter has some good articles on neck turning.

Be careful with using a tube micrometer, I was not getting correct results with mine. Something I did find out using the tube micrometer is that the value "after firing" was different compared to "after firing + deburr and chamfer" (no trim) so now I always deburr and chamfer my fired rounds even when not trimming.