Im sure most that have been training a while have heard the story of how Larry Scott and the bodybuilders of that time Met at girondas gym to discuss if it was safe to increase dbol dose from one tab a day to two , so 10mg
And thats what Scott used to win his first Mr O..
If that story is correct than Arnold dosing at 400 megs a day seem a bit far fetched.
Ive also read the storys how arnold doubled the doses of what was considered safe at the time also, amoung others where he didnt even measure out the doses just filled his palm with the lil football shaped pills and swallowed.
Its all folklore how ever and the only person that really knows is the big guy himself..
If its good quality pharma grade dbol then you sure as hell dont need 400mgs a day , if you are a bigger guy and cant grow off under 100mg then you have fakes or you are not meant for BB.