Steps from 6.5 Rem Mag to 350 Rem Mag... I don't want to wreck brass...help please

Charlie38

Charlie38

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Hello all.

I have a 350 Rem Mag and have acquired 100 new 6.5 Rem Mag cases. I have RCBS dies.
How many steps to neck up to 350 Rem Mag so I don't wreck any brass. Do I have to anneal the brass after?
Any suggestions would be helpful.

Thanks Charlie
 
I would think it would be way easier to just fire-form. I turn 7mm Rem Mag into 458 Win Mag in one step - I load 12 grains of Unique and fill the rest of the case with Cream of Wheat cereal, some candle wax to seal so the COW doesn't fall out. Google up "COW fire-forming". You just have to get the necks opened far enough that your tapered expander gets into that neck when re-sizing the first time after fire-forming.
 
Regarding annealing - I anneal before I fire form (since the parent brass is often previously fired), and then anneal again after fire forming. I use the salt bath annealing system.
 
I would agree with Potash. fire-form and then use your sizing die. with the die case neck expansion method you do run the risk of some necks being wrinkled/folded back into the shoulder and then the crease is there for ever, with fire-form there is no risk of this happening.
 
There had been an article by Ross Seyfried in Handloader magazine several years ago where he was re-forming a case neck into a larger diameter. He did it with dies, but found he had to make a piloted expander - the pilot was the similar diameter to the inside of the parent neck, then he had a taper, then the diameter of the finished neck. This gizmo kept the expander centered in the neck of the brass all the way through and ensured that the neck expanded evenly in all directions and stayed centered with the case body. I do not recall why he did not fire form.

And the risk of a collapsing neck mentioned above is very real, anytime you are applying pressure against the mouth of the case neck - either going up or down in size!
 
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