Is there a certain peak dosage of hydrocodone as far as the good buzz feeling?

Like, Is there a certain amount to where no matter how much more u take the buzz warm fuzzy feeling won't be any more intense, because I have a very high tolerance, If i take 15mg I feel that warm fuzzy feeling and I feel it a little stronger with maybe 25mg 5 (5/500mg vics) but it seems like no mater how much more i take it doesn't feel any more intense is that just the way hydrocodone works or do u need to take a whole lot to feel that kind of Oxy Buzz? Is it just that hydrocodone is week and makes no difference wether u take 4 or 8?