neck turning Virgin or Fired brass

[paulT]

Paul,
Its a machine shop, so they don't have "Products" like a store. Email/call Kenny Porter and he will give you specific answers to specific questions.

Thanks for info Joe.

 

[Link]

How do you clean the neck id of once fired brass before turning /?

 

[Fliers]

Steel media or brass brush would do it.

 

[Brians356]

One good point is to measure the length of new or sized? cases for overall length. If they vary by more than 0.003" trim all to the shorest one. The reason for this is the turner stops cutting into the shoulder area by the end of the neck touching the shoulder on the mandrel. If the cases vary in total length the stop will cause a different cut into the shoulder on each case.

Joe, that's why I feel it's best to index off the shoulders when trimming necks. Then, the stop for the neck turner (case mouth) should be the exact same distance from every shoulder, and produce the same depth of cut into every shoulder.
-

 

[muleman69]

I made this video just for you .

Joe

Thanks Joe,your video was awesome. I will be watching this for days. What great info

 

[Uncle Ed]

If you neck turn the case on the right you will still have runout with the case body.

redding-reloading.com/tech-line-a-tips-faqs

Tech Line & Tips (FAQs)​

Concentricity Problems​

a.k.a Neck Runout With Bottleneck Cases

We have conducted many tests over the years on the various factors contributing to concentricity problems with bottleneck cases. We have repeatedly found a definite correlation between the uniformity of the brass (or lack of it) and the resulting concentricity of the neck to the body of the case.

An interesting experiment also revealed that neck turning of brass that was intentionally sorted as non-uniform, showed little or no concentricity improvement when used in standard S.A.A.M.I. spec chambers. Conversely brass that was sorted and selected for uniformity remained uniform and concentric with or without a neck turning operation.

Note that to this point we have not talked about seating dies. That is because 98% of all concentricity problems exist in the brass prior to bullet seating.

Keep in mind that no seating die ever made will correct problems. The best you can do is to obtain a quality seating die that does not add any.

 

[searcher]

I also think it is your expander button. I'd measure runout on a piece of brass, remove the expander button, size again, then re-measure runout. If it didn't greatly reduce - you have other issues. I'd loosen your die in the press about 1/8 turn so that it is not locked down and try again. I'd also look to see if you have crud built up in the back of your shell holder. The idea is to get the runout out of your brass as a separate operation than neck turning - as others noted - neck turning will only shave crooked brass and you still have crooked brass.