Looking to learn from the experts on felt recoil from two different powders. I loaded 168 gr smk for my AR10 for load development and used imr 4895 and 8208 xbr. There was a significant difference in felt recoil between the two even when powder weight were a grain apart. Does this have to do with there burn rates and how the combust. 4895 gave the bigger recoil felt over 8208 xbr. Used same brass same primers same seating depth on both loads. Any info would be great to learn about the world of powders.