Building what I hope to be called an all around rifle for Alaska, though it won't be a primary rifle for the big bears. Under all conditions what scopes/reticles do you give your blessings to?

I lived at Ft Greeley for a year so I understand what cold can do to mechanical items. Do you feel an illuminated reticle is in order for those days which are shorter in light and longer in dark. No dialing up, just a BDC type of reticle for holdover if the range gets out to 500-600'ish.

Thanks,

Alan