1. First thing to do is learn how to spell "bullet". Second is to know that "bullet" is sufficient and adding "head" to it is a mistake. Third, put only one "i" in Prvi. (Hey, you said "any advice welcome"!)
2. In general, you can safely substitute data intended for a somewhat heavier bullet. A 2% difference in weight is pretty inconsequential. Normal lot-to-lot powder variation is often greater than that.