I also use IMR 4064 with a speer 150 gr mag tip. My rifle likes a mid range load 46.2 grains. 43 to 48 grains is the range for the IMR 4064, and like pajack states start low and go up by .5 increments untill you find a ball park load where the rifle shoots well. Then you can work up and down by .1 grains to fine tune. Do not exceed 48.0 grains for this powder and bullet combination! Try Ebay or cabellas if you can't find a mannual