Depends some on your goals. If you want something in low to mid velocity range and economical, 4198 would be a good choice.
For some mid range loads 3031 or Varget.
For some smoking high vel loads, BL-C2.
As with any caliber, there are lots of possibilities in choice of powder. Maybe you already have a can of one of those mentioned? If so give it a whirl. My experience lately tells me that you can't always buy any kind of powder, but choices are limited to what is in stock, or on hand. So I usually buy powders that can be used in several of my rifles when I see some in stock. Varget, 4198, 4831 and 3031 are among those. You can load about anything in rifles with these and I often find them available.