I am trying to get one hole groups with a custom gun I had built and chambered in a 300RUM. Best I can do is .9 MOA consistently. So I decided to try neck turning. I have a sinclair kit with expander die. I FL these cartidges and check for consentricity, and everything is within .002" or better at the necks. 1st problem is my expander ball on my RCBS dies are not large enough. It is .306". I need it to be .307" to fit my neck turning mandrel. So I have to run all of them thru the expander. This was tough. I lubed well with imperial wax. I even stuck the case mouth in the lube. Sometimes would pull out the expander mandel out of the body. I then neck turn all 20 cases. I check again for consentricity. Either the expander ball or the neck turning itself, knocked the necks out.

I had .004 max run out on the necks. Kinda defeats my neck turning.

So no have to run them thru a FL again.

I know vapordog, your saying, told you so that neck turning is a waste. But hey, its fun trying. I think it maybe better to buy brass in bulk and go thru it with a neck guage and pick out the pieces with good necks instead of making the brass good.