300 grain XTP @ 1400 fps ( seated to the bottom cannelure ) from my Super Redhawk does it for me … However , you need to be vigilant of the S&W cylinder over all length and the twist rate . I know the SRH’s have a 1:20 .

I'd go with the 305's you mention = sledgehammer .

Last edited by bulkie_roll; 08/11/20.