Ladder test are normally .5 grain increments for larger cases and .3 for small cases. Looking at the Lyman 49th edition manual, starting load for 174gr, IMR4064, and an OAL of 2.780", is 39.5 gr and 44.3 gr max, PSI listed at 61,100. IF, your OAL is longer, using a bolt gun with 63k PSI, you...