So how did i do this??

[Shawnba67]

I was playing trying to form 6xc from 243. I ran it through a shortened 308 die this pushed the shoulder back and gave it a funny neck. Then I attempted to run it through a 6xc die this damage felt like it happened as it entered the die.
Im very curious how??
I did the same process to a piece of 06 brass and have a neat looking xc with a 1" neck just like I expected.

 

[joshb]

PMGuffey! It looks like somebody finally pushed a shoulder back!!!

Did you anneal it first?
I've made some brass like that. I think it's just a matter of the brass below the shoulder being too weak to take the "push" of a hard shoulder.

 

[spife7980]

PMGuffey! It looks like somebody finally pushed a shoulder back!!!.

That was good.

 

[Shawnba67]

I have only tried the one piece. Is there something i can do to prevent this? Or did i lead off with the 1-50 lost pieces?

 

[riflewoman]

You need an intermediate die. If you can find one, get a 30-06 to 22-250 forming set. RCBS made them and maybe Redding...

Could also check with the OP of this thread. http://forum.accurateshooter.com/threads/forming-6xc-brass-picture.3866238/

 

[dstoenner]

I have been making 6x47 lapua out of my old 260 Remington brass. I am pushing the shoulder back even further than you. And yes i doget either this crinkled case shoulder junction or i end up with a folded in pirce of the shoulder. My success rate is about 50%. If i start with 6.5 creedmoor brass I get about 80%.

The problem is that we cannot tell how thick the wall is relative to the shoulder brass we are trying to form. One trick i have used is to take the neck bushing and the stem out of my sizer. That way i am only trying to reduce the neck to about .255. That takes some of the load off. Then i use imperial sizing wax on the case. Do multiple times on the press handle. Take the case out and recoat the case and do the the operation a little further. Once i get a good looking shoulder i will then trim to length and the size the neck fully

HTH

David

 

[searcher]

I had that happen when forming .243 from .308, but only with some Federal brass I had that was "over-annealed". Didn't do it with the factory new Winchester brass I tried next using all the same steps. I agree that an intermediate die, along with a good coat of Imperial wax should be the fix - unless you are using brass that got a little hot, as I did. I'd try to use a body die, so you are not necking down to smaller, then back up (say from .308 down to .224" than back up to 6mm, for example.

 

[Shawnba67]

You need an intermediate die. If you can find one, get a 30-06 to 22-250 forming set. RCBS made them and maybe Redding...

Could also check with the OP of this thread. http://forum.accurateshooter.com/threads/forming-6xc-brass-picture.3866238/

I actually did. He used a shortened 7-08 body die. which I thought I had closely approxamated with my modified 243 die. Then an xc die.
On further thought I may not have removed the expander de capper. That small detail might be pertinent.
I want this to work as i have 100 lapua 243 cases i boogered up on skim turning the necks. I can salvage them as Xc cases.

 

[Metal God]

So that's what the new telescoping ammo looks like .

 

[Ledd Slinger]

Its because you can't take a 308 case size neck down to a 6mm neck in one step. WAY too big of a jump.

I wrote an entire detailed article on forming 6XC from 308 family cases somewhere in the forum. I'll try to find it for you.

You need to use a shortened 7mm-08 body die. Redding makes them. This forms the shoulder down where it needs to be AND drops the neck to 7mm. Then when you run it in the 6XC die, it takes it down the rest of the way just fine.

 

[Ledd Slinger]

Heres the article I wrote on forming 6XC cases a while back. It has all the details you will need to easily and successfully form 6XC cases. Read through all the pages to get all the info.

http://forum.accurateshooter.com/threads/forming-6xc-brass-picture.3866238/

In one of my posts on the first page you'll see that I talk about how you will crush the shoulder if you try to use my 2 step forming process with a 308 die.

 

[Macropod]

You are on to something here.

The world's first head space self-adjusting cartridge case! Using concertina technology.