I hope you're not as confused as your post leads me to think. Firstly, you can have a reamer made to whatever specs you desire within reason. Custom reamers for a specific cartridge will usually have smaller-tighter necks and maybe shorter or longer throats, than SAAMI specs, depending on which bullets the shooter intends to use. Please also be reminded that the 7mmWSM and 7mmRSUM cartridges are factory rounds but are NOT interchangable. If you have your new barrel chambered for 7mmRSUM that is the only cartridge case you should shoot in it. Reforming brass is a separate topic.
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