Adjusting Neck turner

[deweyduck]

By "lopsided" do you mean that the neck thickness varied? Concentricity of the neck to the body is what most people mean by concentric necks.

When you FL size the neck OD will be concentric with the body (less than .002" t.i.r.). If the neck wall varies then the bullet will not be centered with the bore when the round is chambered. That is why you turn the neck. The neck turner pilot follows the neck ID as it cuts the neck wall. Then when you FL size the case again the bullet will be in line with the bore as the neck OD and ID will be concentric with the body.

Lopsided was a bad statement of my problem. When I trimmed the high spots off, the trimmed spot was thinner than the low runout spot. Expensive lesson but now I think I got it. But, what runout do you tolerate before neck turning a resized round? Thanks for your help!

 

[17TACnes]

I had the same problem the setup of my turner. I just kept having to adjust it back and forth and finally it settled into a spot that I was happy with. The Sinclair turner is a nice tool but a little nerve racking to set up each time.

 

[LVLAaron]

I had the same problem the setup of my turner. I just kept having to adjust it back and forth and finally it settled into a spot that I was happy with. The Sinclair turner is a nice tool but a little nerve racking to set up each time.

It really is annoying to set up. I've decided to just leave my set up for 308 and never adjust it again. If I need to turn another type of cartridge I'll get a different turner.

 

[skeeljc]

It really is annoying to set up. I've decided to just leave my set up for 308 and never adjust it again. If I need to turn another type of cartridge I'll get a different turner.

You might try a K&M next time. Their cutter adjustment screw is accurate and has little backlash. It is always best to sneak up on the cut rather than try to back up. I find it easy to take cuts as small as 0.0001".

 

[LVLAaron]

You might try a K&M next time. Their cutter adjustment screw is accurate and has little backlash. It is always best to sneak up on the cut rather than try to back up. I find it easy to take cuts as small as 0.0001".

I have one that Fred Sinclair made by hand a million years ago. I think I'm going to tap the cutter adjustment with a fine thread and just use that. Will be very similar to the K&M tool.

 

[skeeljc]

I have one that Fred Sinclair made by hand a million years ago. I think I'm going to tap the cutter adjustment with a fine thread and just use that. Will be very similar to the K&M tool.

The K&N tool uses a "screw within a screw" concept to achieve 0.002" cutter advancement per revolution of the adjustment screw. That is a very fine adjustment.