I was working up a load for my 308 I worked it up to 45.5 grains of varget and decided to stop I was happy with the velocity, But a few days later I decided to see what Kind of velocity I could hit workin it up a bit more. The max load is 46 grains, But when I fired one with 45.7 grains it considerably flatten the primer alot more then it does with 45.5 grains, but when I fired another this time with 46 grains the primer was only flattened like it did with the 45.5 grains. what does this mean??? why am I getting a good sign of pressure increase with 45.7 grains and not with 46 grains?? I'm am confused with this one