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!
 
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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