Mercuric primers were what damaged cartridge brass. I'm pretty sure that's pre 30-06 era.
It's the potassium chlorate primers a 30-06 shooter would be concerned about. They leave salts in the bore.
Yes, US Ordnance went away from mercuric primers in 1898. They stuck with potassium chlorate until the 50s, even though non-corrosive primers had been developed before WWII, because the chlorate primers were considered more reliable.
Potassium chlorate primers do nothing to the brass. The salty residue left in the bore(and gas mechanism if a self-loader) is easily removed with hot water, and as long as you do that and then lightly oil before putting the rifle up after a day's shooting there's no issue. I've used lots of corrosive primed ammunition, back when it was very available and cheap.
Unless the ammunition is degraded and has become unreliable I'd use the ammunition as is, and then wash and reload the brass, rather than going to the trouble of tearing it down.
