For me it has been Barnes .300WM 190gr VOR-TX® LONG RANGE ammunition. My Bergara loves the stuff. Started looking for more in early 2020 for my AZ bull elk hunt. I made do with the 11 rounds I had and filled my freezer with rounds to spare. Kept looking till 2022 when I came across a small gun shop in northern AZ that had some in stock, which I bought. Spoke to the owner and he said he ordered a case a couple years ago and it just showed up out of the blue. Fortunately just in time for my 2022 cow hunt. Have a small supply now.
Since then nothing. I still look several times a week on web sites and my LGS's.