Forming 30BR

[Travelor]

I have been given 150 Norma 6mmBR cases and have attempted to form them into 30 BR. I annealed the cases before using the K&M step up expander tool. After running the expander into the cases, I am getting a bulge just above the neck that I cannot seem to get out. The bulge is such that the cases will not chamber.

Help. Don't want to "spoil" the cases, but need them to be 30BR.

[EDG]

Do you have a 30 BR FL die? If so use it.
That bulge is common when you only expand the brass and do not resize the neck.

[dtknowles]

Could you just blow them out to 30 with a powder charge and filler and no bullet. Do the cases chamber and headspace properly or will the extractor hold the case for fireforming.

Tim

[dtknowles]

Is the bulge thicker brass, if so you will need to neck turn the brass. Actually depending on your chamber and bullet diameter you might need to neck turn anyway.

Tim

[dtknowles]

If you size that brass you will get a donut and need to inside ream as well.

Tim

[cumminsnut76]

Yes neck turning is the answer

[reed1911]

Generally you do not get a doughnut unless you move down in size, he is moving up.

[Travelor]

Do you have a 30 BR FL die? If so use it.
That bulge is common when you only expand the brass and do not resize the neck.

Thanks to all for your suggestions.

I have a Whidden FL die with neck collets. The die will not size the neck all the way to the shoulder. And yes, I can see the bulge looking inside the case just before the shoulder.

I have taken the neck collet and pressed it down on the bulge using a 223 die to bump the collet against and this helped some, but a slight bulge is there. My gun is currently being barreled on 30 BR so I cannot try the cases yet.

[dtknowles]

Generally you do not get a doughnut unless you move down in size, he is moving up.

In this case it seems some of the parent case shoulder is moving up into the neck.

Tim

[Doc Highwall]

Here is an article about necking up 6mm BR to 30 BR.

http://www.accurateshooter.com/cartridge-guides/30br/

[dtknowles]

Here is an article about necking up 6mm BR to 30 BR.

http://www.accurateshooter.com/cartridge-guides/30br/

Well there you go, that and the embedded links that's a pretty complete story. My cases are made from 300 Savage brass but the issues are pretty much the same.

Tim

[leadhead]

I shot a .30 BR for years in IHMSA and always just used .308 cases.
I have the dies and haven't used them in years. You might have
better luck forming them in a regular full length sizing die.
Denny