All I use is rcbs. I've never had problems with ammo having any runout. I use a lee collet die to neck my 243 and 308. Although I've always wanted a Redding bushing die for my 308 when I shot fclass.....
For competition I would say Redding dies would be a good choice. For the 7mm you might also want to look at the belted magnum collet resizing die here: Innovative Technologies - Reloading Equipment
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