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Brass Choice

For your 300WSM the best would be LAPUA and ADG!

Norma would be your best choice of what you say you already have. JMO
Correct.

I would start with what you have to vet your skills to 1000 yards. Then figure out if that last 2% matters at this point.

I would separate between makes. They may shoot to different POI and age differently. So, if you don't have at least 50 of one brand, it may be worth buyin* new.
 
If you have the money and want to spend it buy top quality. If not run what you brung! Like many have mentioned, clean it and don't mix headstamps. I'm confident you'll find a satisfactory load with what you have. Read up on prep and be diligent with that. Otherwise start loading it and I think you'll find the mental maturbation regarding brass is rather futile. We have loaded what some call "crappy" brass in certain rifles for years. Point is, some of it just works! So give it a shot!
 
If you have the money and want to spend it buy top quality. If not run what you brung! Like many have mentioned, clean it and don't mix headstamps. I'm confident you'll find a satisfactory load with what you have. Read up on prep and be diligent with that. Otherwise start loading it and I think you'll find the mental maturbation regarding brass is rather futile. We have loaded what some call "crappy" brass in certain rifles for years. Point is, some of it just works! So give it a shot!
"So give it a shot" ...pun intended!
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