I confess to being a ballistics chart junkie. Saw my first chart at 12yo and been digesting them ever since. Had me a264 Win Mag I bought thru the mail (yeah heck you could do that back then) when I was 16yo. Lugged that 264 around for 25 yrs then sold it ( i HATE it when i do dumb stuff) . Anyways heres a nice chart site that will easily give graphic comparison charts just by clicking on the calibers you want to compare: Open Load I was comparing my 7 rem mag to the 7 stw and 338 edge onthe graph. Very interesting. Good luck.