What does it take to neck down 300 RUM brass to 7MM RUM


Well-Known Member
Feb 26, 2003
Can I just run the 300RUM brass through my 7MM RUM dies and be done?

How much will the neck thickness increase?

My 7MM RUM can't use factory brass so I will have to turn the necks anyway. (tight neck chamber)



Well-Known Member
Jun 12, 2001
Palmer, Alaska
Size, turn, shoot, and enjoy how easy that was!

I doubt you'll see a substantial increase. Going from 338 to 30, I don't. But I too must turn them anyway.

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