I am new to reloading so bear with me. I am loading .44 Rem. mag for both rifle and pistol. I fail to see the reason for such a range of loads for bullets of the same weight and general shape . ie; Barnes 225 grXPB (18 grs 2400) vs Speer 225 gr JHP (24 grs 2400). 225 grains is 225 grains and 2400 (Alliant) is 2400.??????????????????