Because he (
@bendavies7 ) was asking about the bullets used in .243 ammunition. He was using 100gr and asked it there was a better/less damaging bullet available in factory ammunition (he specifically said - not home loads).
@FISH BOY suggested Sako Gameheads and
@Primate suggested he start the journey into reloading (which he highly recommended).
The OP never mentioned 'heads' or 'bullet bodies' or 'gunpowder' and if he follows
@FISH BOY 's advice will soon become competent in a new skill, helped by the advice from people in this group and using the right terminology too