Would have to agree with Michael. Both those roads will give you good time, and are most pleasant roads through bigsky country. When taking route 200, be sure to make a visit to the National Bison Ranch at Moise. Not to be missed. US2 is a fantastic road which will still see you at 65+ most of the time, and passes by or through some of the local state parks and lakes. As well, you will pass along the southern edge of Glacier NP, where a stop at Goat Lick is a must.

Shelby is a lovely little town.

On my way back from AK, last month, I cut through from Wolf Point to Glendive. That too, was a pleasant route through rolling countryside. I particularly enjoyed the serenity of these routes, which still allow one to maintain around 65 for most of the way with very little traffic!

Lifey