OK, i am gonna give that a test sooner or later, i hope this week, i will choose one film but i have to see which developer i have will use for this purpose.
Now how i should do it, using 400ASA film and exposed it for 800, then develop as it is 400 or 800? I think there are EI datasheet for each film or each developer i can follow, is this the way to do it?

Checking up my films, i chose 4 films to vote for which one to use for push procoess: TMAX400, Tri-X400, HP5 and Delta400.