learned something today, suggestions....

[18Echo]

I ran 100 virgin 30-06 over a sinclair expander mandrel (each shell up, twist, up again), then I attempted to turn them on my K&M neck turner, wouldn't twist over it and barely got on it. Tried it on my Hornady cutter mandrel and slipped right on.

measured K&M mandrel and it was .307, went and measured the Hornady mandrel and it was .304. measure the inside of the brass at .305-.306, so I'm getting springback after running over the expander mandrel.

Anneal and run over expander again?

thoughts, suggestions?

 

[dareposte]

Re: learned something today, suggestions....

.307 sounds like it will not have enough neck tension, so I assume you'll resize it again after trimming?

What are you trying to accomplish? Is the brass not of uniform length in the virgin state?

 

[Victor N TN]

Re: learned something today, suggestions....

I have several expander mandrels. It's generally suggested to buy the expander mandrel from the company that makes the neck turner. I know that between some there are as much as .003" Don't expect something that tight to turn freely.

 

[18Echo]

Re: learned something today, suggestions....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dareposte</div><div class="ubbcode-body">.307 sounds like it will not have enough neck tension, so I assume you'll resize it again after trimming?

What are you trying to accomplish? Is the brass not of uniform length in the virgin state?

</div></div>

Not talking about trimming to length, but of neck turning to uniform tension. After it gets uniformed it will be run through a redding bushing die for tension.

 

[dareposte]

Re: learned something today, suggestions....

Oh that makes a lot more sense. Sorry can't help with that!

 

[Victor N TN]

Re: learned something today, suggestions....

When you find the mandrel that works right, be sure to keep plenty of lube on it. I mix 50 : 50 of STP oil treatment and 5W-30 synthetic oil. That much will last you a life time.

Also something to think about. I double rinse my finished brass in lighter fluid to get all the oil & residue out of it. Blow it out with an air hose from both ends, and let it set overnight. Next day it'll be ready to go.

 

[USMCj]

Re: learned something today, suggestions....

I use a K&M expanding mandrel and Pumpkin neck turner, never had a problem. I did however polish the mandrel to a chrome like finish so it wouldnt scratch the inside of the necks.

Are you trying to neckturn fired brass? if so, anneal it first then try again. I always neckturn brand new brass before being fired, so maybe thats why I have never ran into this problem.

 

[18Echo]

Re: learned something today, suggestions....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: USMCj</div><div class="ubbcode-body">I use a K&M expanding mandrel and Pumpkin neck turner, never had a problem. I did however polish the mandrel to a chrome like finish so it wouldnt scratch the inside of the necks.

Are you trying to neckturn fired brass? if so, anneal it first then try again. I always neckturn brand new brass before being fired, so maybe thats why I have never ran into this problem. </div></div>

No, this is virgin Nosler and Winchester brass. All the case prep has been done except the neck turning. I'm gonna go to Bruno's today and pick up the K&M expander die and mandrels and see if that helps. I'll chuck up the mandrel on the cutter and run some bore paste over it too, see if that helps.