300 win mag and 300 Rem Ultra Mag



I believe the RUM take a RCBS 4 3 But you may be able to get away with the one you use for the 300win. Not sure!


Well-Known Member
Apr 17, 2003
North Carolina
RCBS #4...300WM
RCBS #38...300RUM
They look basically identical.
I used them interchangeably, with no problems...sakofan..


Well-Known Member
Sep 25, 2002
my #4 wouldn't take my RUM cases without putting a lot of presure on the case to force it in. RCBS told me that they have encountered different dia rims,..so they recommend the #38 to fit them all.

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