dasher neck turning how to??

[skeetlee]

Im a short range guy but I am going to play or attempt to play the 600 yard game here in a couple weeks. I am going to chamber a dasher up as soon as I can get my hands on 6mm 8 twist blank. I bought a new dasher reamer some time back but I haven't used it yet. My reamer is a .266nk with a .145FB
What I need to know is what procedure do I use to neck turn, and how far down the case on a BR do I go? Can I neck turn just far enough down to create a false shoulder for FF? Do I turn all the way down right off the bat? How do you dasher guys turn your necks? Much appreciated. Lee

 

[ridgeway]

Here is how I do mine...

 

[Phil]

Chuck,

What is the neck dia. on your reamer???

Phil.

 

[ridgeway]

I use a .264

 

[Phil]

Necks turned to .0095????

 

[ridgeway]

I've been turning all of mine to .009".

 

[mr45man]

I just did 100 new and 20 used/fired pieces as test rounds
the same way.
Worked great and did not lose a case .
I cut the necks open on a few test cases to see exactly
how far to turn the necks and tweaked the depth .

Here is how I do mine...

 

[LHSmith]

How uniform are the FF lengths? Are you guys FF dry?

 

[40X Guy]

Lee, call Pat at PMA tool and order one of his neck turners custom set up for cutting the 6BR cases and a loaded round of .264 which would be .0105 neck wall thickness. Quick and easy, then fireform them using the false shoulder provided by the cut on the parent 6BR case. Jam some 107 Sierras into the lands .010 with 30 grains of Varget and you will be in business. I get blow lengths of around 1.545 to 1.548. Quick turn a round also by PMA.

Frank

 

[potatoe]

I turn my necks to the desired thicknes .260 down from the case mouth on the BR brass. Don't turn the whole neck on the 6mm BR brass

 

[Phil]

I turn my necks to the desired thicknes .260 down from the case mouth on the BR brass. Don't turn the whole neck on the 6mm BR brass

What do you end up with for a OAL on your FF cases turning the necks .260 down the length of the neck???

Phil.

 

[potatoe]

1.540 FF
1.545+ COW
I use the false shoulder on both

I don't think that turning the necks prior would have much to do with the finished overall length, but I've never experimented with that

 

[Phil]

Does your Bat have an ejector???

Do you remove it for fire forming???

 

[ridgeway]

I shoot a 1.555 chamber length and don't care what my blow length is. I trim to 1.545 and all are longer when formed. With my FF barrel, they come out 1.550-1.555. BTW, my print states a 1.555 chamber length. Its longer because I had cases longer that fit.

 

[ridgeway]

I just did 100 new and 20 used/fired pieces as test rounds
the same way.
Worked great and did not lose a case .
I cut the necks open on a few test cases to see exactly
how far to turn the necks and tweaked the depth .

Here is how I do mine...

Your chamber should dictate how far down you turn. The idea is the step where you stop turning contacts the chamber neck to headspace off of. I also run lots of neck tension on a jammed 107 with a decent charge of varget or 4895.

 

[ProneKing]

I asked this same question late last year I think. The answer I got was to neck-turn the entire length of the 6BR neck, then you don't have to worry about forming doughnuts during fireforming. Then do the neck up, neck down procedure for forming the false shoulder. I did just that and it worked for the most part. I split 3 shoulders out of 310 pieces. They sure seem to shoot fine!

Proneking

 

[potatoe]

I've never heard of this^. Also if you have a thinner neck chamber so that you have to turn the necks a good bit I think you run the risk of sending a neck down the bore.

 

[ProneKing]

Ok, here is the thread last year where I asked the neck turning/fireforming question: http://forum.accurateshooter.com/index.php?topic=3827130.msg36295385#msg36295385

Some pretty top-notch shooters recommending turning the neck all the way. I don't see how it would weaken it any more than just neck turning and shooting a 6BR.

 

[potatoe]

Prone I'm not saying it doesn't work just that I've never heard of it. Mark King was the one who suggested the .260 to me several years ago and that gets slightly into the NSJ and I do not have any doughnut issues.