I loaded 270 win. using H450 for years and now it has been discontinued. I have been trying to get the same velocity with other powders as the h450 without much success. I have been loading 7 rounds at night or late evening and shooting them the next day. I loaded my 7 rounds using 140 gr. Interlocks and IMR 4831 powder at 53.5 grains. This load for the 7 rounds averaged 2815 fps. That night I increased the load to 53.8 grains with all else staying the same. Today I shot these 7 rounds and averaged 2810 fps. I increased my load by 3/10's of a grain and lost 5 fps. I can't figure this one out.