I have, but I've found that high quality, fireformed brass in a properly cut chamber will do all I desire. That is not to say that you can't shoot smaller groups with a tighter neck and uniform, close fitting brass. I don't think the benefit is worth the time for any but the very best of shots. I know it isn't for me.
I use the K&M neck turner set up for a factory chamber. I think it's not a bad idea for factory chambers if you're looking to milk a little bit more for smaller groups but it's a small increment. Probably helps if everything else (like trigger control and calling shots) is up to speed.
'Course if you've got brass OCD, it's a small price to pay!
For my competition rifles, I use a pair of K&M turners with Hoehn carbide mandrels (but I'd rather have a Pumpkin...), and do a rough cut, then a finishing cut. For factory chambers, I use Lee collet dies.
K&M turner for 6ppc - great tool. Have tried it for 308 and it makes me feel good, but does not improve scores. Kinda like wetting your pants when you wear a dark suit ... makes you feel good, but no one notices!
Let me see if I understand this whole neck turning thing...
You pretty much have to turn necks when you are forming brass by necking down a significantly larger parent neck, right? Otherwise your neck will be too fat and either the case won't chamber or you won't be able to fit bullets into it.
You 'may' want to turn necks for accuracy, by truing up the section of the brass holding the bullet, so it doesn't drag the bullet unevenly as it starts its merry trip down the bore, right?
But my expander (critical to doing the process correctly, is sized perfectly for the two mandrels I bought from him. Plus, the mandrels have an extension on the back. I chuck the turners into cordless drills or a lathe, and have at it. Some folks like to swing the case, but I've found that swinging the turner results in better concentricity.
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