Keep in mind that the bottom of the posts doesn't necessarily bear all of the weight - a great deal of the weight is borne out in the friction of the side of the posts in contact with the backfill material of the post hole. That is (more or less) how piles work - there is no "footer" per se. Poles for pole buildings also function the same way, just not as deep.
I've seen some pole building manuals recommend to NOT use a footer underneath the bottom of the pole but instead pour a concrete "necklace" around the pole (using lag bolts screwed into the pole to bond it to the concrete necklace). This increases the area in contact with the ground, increasing friction, and increasing load capacity.
So I would say that even if you think you might be marginal or below standard on the pressure for the footer area, you're probably fine by the time you add in the amount of pressure you will get from the pile friction.
Good luck and take care.
I've seen some pole building manuals recommend to NOT use a footer underneath the bottom of the pole but instead pour a concrete "necklace" around the pole (using lag bolts screwed into the pole to bond it to the concrete necklace). This increases the area in contact with the ground, increasing friction, and increasing load capacity.
So I would say that even if you think you might be marginal or below standard on the pressure for the footer area, you're probably fine by the time you add in the amount of pressure you will get from the pile friction.
Good luck and take care.