According to American Reloading, it is BLC(2)-ish. The price is very low. At $15/# shipped, hard to look away for bulk reloading. ( I thought it might be recovered powder, but they state it is new).
https://americanreloading.com/en/266-reloading-rifle-powder?orderby=price&orderway=asc&orderway=asc
https://americanreloading.com/en/266-reloading-rifle-powder?orderby=price&orderway=asc&orderway=asc