I have just been using 308 brass for my 260 REM brass .I gave up looking for brass for it .I shoot cloverleaf groups at 100 yards with my 308 brass necked to 260 with lapua 155 grain mega tip bullets.I have about 15,000 pcs of 308 brass so I am set for a while .I saved so much on brass for my 260 I bought another 260 .I use my 308 brass that needed to be trimmed.It fills the chamber nice and is accurate and is the correct length when fired once .I hop Remington makes some more 260 brass.