I will be going to Maine this year for a black bear hunt. I am going to use either my 4 inch S&W500 or my 6 inch BFR in 500MAG as my primary weapon. I am leaning toward my S&W500. Now all I have to decide is what bullet to use. I have 275 gr. Barnes, 350 gr. Hornady, 370 gr. cast with gas checks, 400 gr. with gas checks, 440 gr. cast performance, 575 gr. cast with gas checks. Which would you use?