Question For JT

I just looked at my 4" Model 29, it is a 29-3, would that include the "endurance package", do you know? Below you mentioned no Redhawk loads in any Model 29 and I won't, but I am curious. If I choose to shoot 300 gr. loads am I OK doing so in my Super Black Hawk? I probably never will as I normally shoot 240 gr. jacketed, and hard cast.