No, I' m not recoil sensitive.
Yes, hot rodded .30-06 loads aren' t a problem.
I shot a .600Nitro custom once, and often shoot a .50BMG that doesn' t really count (on a tripod with dual shoulder wraps and butterfly grip), but shoot .458Lott and .416rigby sporters quite often.
Just from practice, I RARELY~NEVER flinch, I won' t say NEVER, but it' s once in a blue moon or only when I forget ear plugs or what I' m doing. I can' t say a given cartridge that would make me flinch because of this, if I' m not paying attention, sometimes I flinch when I shoot my SKS, just because it' s so FREAKIN LOUD!!

One thing to remember though Bigbulls, a shotgun blast is a much longer shove than a high-powered rifle kick, that' s why most never complain about shotguns kicking too much, it' s kind of like the .480ruger and the .454cassul, regardless of the fact that the .480 actually kicks harder, it feels like a long hard shove, as opposed to the sharp hard kick to the hand of the .454.