I used to buy R-P and Win brass and prep the heck out of it. Got tired of that finally and now just use Lapua and Norma. No prep required. As I see it, the good stuff is Norma, Lapua, and Nosler. As for case life, it’s my opinion (worth every penny you paid for it) that Norma lasts longest, and Nosler has the shorter case life. But I buy Lapua, except for my 270, and use Norma there.
That said, if you want a very accurate rifle, you should buy one. High priced brass won’t a sow’s ear into a silk purse, to butcher an old saying.