I've used rem rifle brass since the 80's. the 30-06 is pretty much brass I've used sine the early 90's, though some was shot & kept in the 80's. 30-06, 22-250, 30-30, 444 marlin, for a while I had a 25-06, all rem brass. most of my 223 is rem, though I do have some hornady mixed in with that.
My 22-250 brass I bought new in 97 or 98.
But I haven't bought any in a long time now so I can't say about recent stuff. the only new brass I've bought in years is hornady 6.5 grendel.