Neck turning the shoulder

[jawjaboy]

Before I turn the necks of a bunch of new Norma 284 win brass, I have a question of just how far down do you turn into the shoulder? I'm using a 21st Century turner 35 deg cutter. I've got the thickeness set for .0055" clearance for the .318" neck chamber. Here are 2 test turned necks. Do either of these (left and center) have the correct depth for the shoulder turn? Thanks.

 

[21shooter]

Hi Frank, The center pik is the good one. Slow down on the feed-rate.
Feed in and out at the same feed-rate.The carbide cutter i grind is designed to cut in both directions ..Thanks, John

 

[LCazador]

Somewhere in between those two cuts would be ideal!

 

[Phil]

I turn just to touch, like the center one......

 

[LHSmith]

I turn until I can just begin to detect a ridge with my fingernail. When in doubt, sacrifice a case and section it with a dremel tool so you can visually see how much wall thickness remains.

 

[jawjaboy]

Thanks John for the advice. Much appreciated. Trying to get the hang of your cutter. Have been using a Forster on 270 win brass. But your turner is a WAY better tool.

Thanks fellas.

 

[Shynloco]

I turn just to touch, like the center one......

+1

 

[BillPa]

I just touch the leading edge of the shoulder. I turn on a lathe, the tip of the bit honed to a slight radius instead of a sharp point. It makes for a better finsih and rounded transition instead of a sharp step.

Bill

 

[SmokinJoe]

FWIW, my philosophy on neck turning is to 1st determine whether there is a probability of having any sort of donut problem at the neck/shoulder junction. If there is no known problem in that area with your particular brass, then a cut just touching the shoulder should be fine. However, if your brass is known to want to produce a donut, or tight internal spot, at the neck/shoulder junction I cut into the shoulder in order to thin that area a little. After FF there should be no future problem no matter how deep you have to seat the bullet. This will probably take a little experimentation to determine optimum turning procedure. Hope this helps a little. Joe

 

[savageshooter86]

I've done both on my 308 brass. No issues with any of them. I think between the two would be good.

 

[jawjaboy]

Thanks fellas.

 

[tenring]

I turned some ppc necks a few weeks ago, and cut just a tad too far into the shoulder. When I sized them, some of the necks tore off and remained stuck in my bushing. Got em out, but not fun. The donut should not be a problem if base of your bullet does not touch it. Err on the side of too little a cut into the shoulder.

 

[Brians356]

I like the middle example, but since the 284 Win has a 35-deg shoulder (which matches your cutter) the case on the left hasn't really been cut as deeply as it might appear.
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