there's only about 4k threads on this- type in m14 match loads and see what comes up- but 150's will do for otc stuff, 165-168's perform best, and 175 is the "beater" load- you CAN run the odd box of 180, . but it's best to turn the gas system off when you do - as to why, it stresses the op rod and a bunch of other stuff- same deal as you don't run any heavier than 173's in a garand-