Least expensive bullets that will still be decent in accuracy are the ARMSCOR and PRVI FMJ's.
then you can go PRVI match bullets. Not shot any yet but they look very much like Sierra MK's.
The Hornady 75gr Amax and BTHP, Sierra 69MK, Hornady 68gr BTHP, Berger 70 and 75gr VLD. Nosler is pretty much a Sierra clone and less money. They have shot well for me in 30cal.
For LR shooting, the 75's are the best with the Amax and Berger tops of this list.
But there is only way to find out what works best.
Jerry