Well Ill be........Las Cruses NM you say?.... Im from El Paso Tx.
Welcome to Savage Shooters.
As far as 260 ammo?........yep, its hard to find.
I purchased 300 once fired 308 necked down to 260 LC brass from a gent out of Arizona and there doing just fine. After fireforming/annealing/neck turning etc there doing just fine.
I was going to neck down my 308 but at the price the gent sold his necked down LC brass for I decided not to do it myself.
I did see some 260 at Dicks but that was some time back and it was a bit pricey.