Sight in and hunt with the same load.......
But I will say this: I always buy whatever cheep stuff I can for plinking sessions at the range. I like to shoot quite a few rounds from offhand, and even left handed, before each hunting season. I see no reason to not use cheep stuff for that.
In the woods though it's always the same load I set the sights with. My dad would roll over in his grave if he knew I went to the woods with ammunition different from what I sighted in with.
And whoever posted the "same lot" advice. Dad would go so far as to keep loads seperated by lots of powder. Same principle.