HELP! 6mm/300 WSM brass making

[eww1350]

Been trying "unsuccessfully" to help a friend make 6mm/300 WSM brass. We have a Redding 300 WSM type "S" die, and bushings .310, .289, .282, .278 and .274..
Have tried Norma and Hornady 300WSM brass just switched to .270 WSM and still having the same failure.. when going from .282 to .278 it collapses the shoulder.
I have annealed the necks, but still have the problem..
I have made every kind of wildcat cartridge you can think of and never had this happen..

Anyone out there making 6mm/300 WSM please PM me with your method and tools...

Please if you haven't made 6mm/300 WSM brass before don't PM me this is a NOT a problem that can be solved with opinions and keyboard experts...
I haven't tried everything...

Eddie in Texas

 

[sdean]

Hey Eddie. Call Randy Robinett-BIB bullets. Seems I was talking to him one day about 25 wildcats and he said something about a 25WSM.. Maybe he can help.

 

[IdahoCTD]

I used 270wsm brass and necked it down with a 6.5WSM die and a 243WSSM die backed off. I would bet using 300wsm will make the neck too thick and try to crush the shoulder. Standard bushing dies aren't great for necking down wildcats IMO.

 

[McFred]

Fredo seems to have figured out how to neck the WSMs down pretty small:

http://forum.accurateshooter.com/threads/gentlemen-i-present-the-220-redline.3934327/

Maybe shoot him a message.

 

[nmkid]

I know it gets pricey but, maybe using smaller down steps. When I have to downsize Lapua brass I will downsize in small steps because of their neck thickness. Sometimes, in the middle of the downsizing, I will stop, anneal the cases and turn them down before going the final down steps. This has worked for me many times. A lot of times I will turn the necks down before I start squeezing them down.

 

[L.Sherm]

Call Bullberrys and get some forming dies I've made 17 cal. brass with them from straight wall 30 carbine brass tell them what your trying to achieve and they will make them in double ended. Have them make it the same degree or a little more than your shoulder angle so you can get down to the neck shoulder junction and do it from 270wsm brass and dont anneal until there formed.

 

[eww1350]

Thanks to all who submitted ideas.. I found out what the problem was...... wait for it.....
The rod that holds the de-capping pin and expander ball (300 WSM sizing die) was .265" diameter, so when the bushing started to reduce the neck it would bind up on the rod body locking the brass neck and bushing together then collapsing the shoulder...replaced the cap and rod from a .243 Redding die...PROBLEM SOLVED... brass easily reduced to 6mm in 3 steps... Test fired rifle shortly after all is well... now on to load development...!!!!!!!!!!

 

[nmkid]

Why are you using the expander ball?