I had about 100 peices of new Lapua brass but just felt like it was time to quit worrying about brass availability. I should have 200 peices of new Rem 260 brass at the door in a couple of days. I knew about the 243 and 7x08, they say the 7x08 works just a smidgen better than the 243. I think the 260 is a great little round and like they say its what the 243 shouldn't been. I have developed a love affair with the 6.5 caliber and it all started with a 6.5 Rem Mag years ago.
Much like yourself I'm a 6.5 collector with several variations. Some of my best 260 groups came from winchester 243 necked up. I've never tried 7-08 brass. Shooting mostly lapua now. Would you have any 6.5x57 brass for trade?