Partially depends on what cartridge. These would be ideal weights for 30 caliber. ‘06, go with the 180gr. Shooting a magnum, 180 or 200. I shoot 200gr out of a 300 mag. If you’re doing a Barnes bullet, you can do 165-180 gr easily. Smaller caliber guns can shoot light bullets as the SD is different for a given weight than a 30 caliber.