140 Core Lokt:
https://www.remington.com/rifle/core-lokt-tipped/29-29020.html

165 Core Lokt:
https://www.remington.com/rifle/core-lokt/29-28417.html

I've ordered from Remington directly in the above linked online store and it was an easy process. They also sell 280 brass, but looks like they are out of stock.