You are 1.5 grains under minimum suggested starting. that's if your scales are correct, could be more. In rifles it is bad practice to undercharge, especially if using fast burn powder's. With the case laid out level in the barrel an undercharged shell will have more powder surface to ignite, resulting in higher or extreme pressure. Lord help ya if the powder is laying below the flash hole. Sounds like you may have several variable's, this is just one of them.