I'm leaning on the 175gr MK at 2950fps in both my 24" 300Whizzums. I'm sure I could eek more but that velocity has shown the most promise in all areas and that includes keeping my lips hooked to my face.
Actually,the 7SAUM impresses me much more. It delivers copious speed/Ooooomph coupled with sensational accuracy and a VERY mild felt recoil level. Hard to ignore such things.
In my personal lineup,the 30's are gonna be for play and that 7SAUM is gonna get very bloody......................