I work up my loads in 1gr increments for the larger capacity cartridges(50gr+) and .5gr increments for my small capacity cartridges.I look for a load that keeps consistant accuracy when the powder charge is increased or decreased by a grain.These loads tend to be much more stable in the changing temperature conditions that occur during hunting season.The loads whose accuracy changes substantially by increasing or decreasing the powder charge by .5gr or 1 gr tend to be very inconsistant when the temperature changes so I don't use them for hunting.There is no point in developing a load that shoots 1" groups at 70 degrees but shoots 2" groups at 30 degrees because we have no control over the conditions that we hunt in.