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The topic of going over max loads always makes me smile. I was asked the other day to look up the max load for a certain caliber with 175gr bullets....one manual says max is 69.9 and the other manual says 75.5gr's so which one is correct????? As Ackman said manuals are guidelines but in our litigious society they certainly cannot say that.  I have noticed on more than one occasion that certain manuals seem to take data from other manuals because they match exactly on the starting and maximum charges and with all the variables what are the chances of that happening. I have a treasured piece of memorabilia,reloading data from 1956 that Hodgdon's handed out with their powder which was all surplus military powder that time. Data was compiled by B.E. Hodgdon,Jack O'Connor and a few loads from Roy Dunlap with notes out to the side like"probrably maximum but no pressure signs" or TOO HOT! which was what Jack O'Connor wrote by a load of 63gr of 4831 that gave him 3350fps with a 130gr 270 load. It makes you realize these guys were literally flying by the seat of their pants but using common sense and a watchful eye managed to live long lives with all thier body parts intact.  I cannot quote verbatim but I remember Jack writing that reloading was kinda like driving a car if you had faulty brakes and bad tires you best not be driving high speeds down a crooked highway but with a good safe car you could wind it up a bit and feel safe.His point being that manufacturers don't really know what kind of equipment your using,modern very safe or old worn out military surplus and or some custom cut tight chamber so they tend to error on the side of caution.