6ppc neck turning ?

[AkDan]

So I have a few questions. I'm new to neck turning but understand the principle.

I'll be tuning 220 Russians for a ruger m77 mark II in 6ppc. I have the K&M expander and neck turner.

I am forming following this post on the subject. http://www.takdriver.com/showthread....-for-Benchrest

The main questions are regarding how far up the 220 to turn after expanding. The junction of the neck and shoulder are not as prominent as in a formed ppc case. I wonder about the doughnut. Can you or should you run the turner over fired brass assuming (I think) the teeth on the neck turner mandrel will take any doughnut off?

The next question is how much. My neck was cast at .270 by a local gunsmith. I was thinking of taking enough off to get a loaded round to .268 or .269 hoping to keep from splitting necks. This is a predator rifle. I'm currently shooting brass that have the necks turned to .010, loaded rounds are .265. A buddy is using a custom nula in 6ppc. 220's are starting out at .0155. Loaded un turned is .2715 to .272. Is .269 enough or should I turn down to .2685 or.268?

I'm running redding deluxe dies for now.

Thanks or any help on his.

Dan
Ak

 

[LHSmith]

The URL (?) listed did not work for me.
Turn brass for this factory issue PPC to 0.003 total clearance minimum- 0.004 would be better. Make the cut into the shoulder of virgin brass just enough that you can verify by inspecting with a loupe or magnifying glass.
Best way to get the feel for this would be to turn one as above and sacrifice this case and section one in half lengthwise from the mouth to just above the shoulder, and you can visually see how deep your cut is.
If your bullet base is forward of this neck/ shoulder junction, don't worry about donuts.
I replaced the K&M carbide donut cutter with the standard cutter due to it scoring the neck ID.
As you turn brass, heat build-up with-in the tool can cause different finish dimensions, figure out some way to maintain near constant temp.- some make an effort to cool the tool between cutting, some prefer to pre-heat before starting the first cut. In a factory rifle +/- a few tenth thousands variation will never show on the target.
Best results if neck turning would be to use bushing dies to help with load tuning and Harrells Precision sizing dies would probably ( a call to them would confirm this) offer the closest fit.

 

[Shynloco]

Can you or should you run the turner over fired brass assuming (I think) the teeth on the neck turner mandrel will take any doughnut off?

Dan
Ak

Dan,
According to every precision shooter I've spoken to and read articles they wrote, yes turn the necks, slightly into the necks and remove the dougnut, even on previously fired brass.

Alex

 

[AkDan]

The link showed a guy expanding the 220s out than turning, than forming/firing.

My confusion is in the 220's before they're formed. The junction of the neck to shoulder is more U shaped than a sharp junction so I'm not exactly sure how far to turn back. I guess I could turn down to size and then fire form and see what I end up with.

Makes sense on cutting them in half lengthwise. Thanks for the dimensions. I wasn't sure whats enough to allow the case to release the bullet without getting spikes in pressure or worse....vs what is too much turning to shorten case life.

At some point I'd like bushings. This is a predator rifle so for now I'll have to stick with my dies until I get things tweaked. Gives me a good excuse to tinker, get it where I want it than change LOL. I will book mark Harrels dies though. I do want a better bullet seater than the one I have.

 

[WyleWD]

Turn brass for this factory issue PPC to 0.003 total clearance minimum- 0.004 would be better. Make the cut into the shoulder of virgin brass just enough that you can verify by inspecting with a loupe or magnifying glass.
Best way to get the feel for this would be to turn one as above and sacrifice this case and section one in half lengthwise from the mouth to just above the shoulder, and you can visually see how deep your cut is.
If your bullet base is forward of this neck/ shoulder junction, don't worry about donuts.

LH has it correct. I have a couple of these fine Ruger 6ppc rifles too. Your neck measures a couple thousandths higher than mine do. For a hunting rifle, I'd turn the necks to .267 or .268. Totally agree that if bullet set is forward of neck junction, don't worry about donuts. Darned nice shooting rifles aren't they? WD