Preference on Empty Brass

I'm about to order some 7mm magnum empty brass for reloading and am interested in case consistency. I would like some opinions on who makes the most consistent brass.

I am currently using Winchester brass that I purchased back in the late '60's but only 5 remain. The heavy barreled rifle shoots very good groups with Winchester brass and with loaded cartridge axis checking - well under 1 MOA. So I am a little biased towards the that brass. But the brass is over 40 years old.

Which brand is recommended? Thanks.

PS Or is this like asking what motor oil is the best?

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