7MM ultra Mag Brass

I use 300 rum brass and neck down I also shoot a 338 edge so I have a bunch of bertram brass that I have simply necked down. graf and sons have 7 rum norma and nosler in stock
 
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Yes, 300RUM run through a 7RUM sizer works perfectly. That's what we had to do when they came out and there was ZERO 7RUM cases available, except loaded ammunition.
 
Not sure if your dead set on Remington but all I have ever used is Norma brass for my 7 ultra. Good quality and you can find it usually.
 
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