Tournament spot was my jam a punt

I only play cash and want some advice on a tournament spot

Local tourney small stakes ( 300 buy in ) 10 players remaining from 13 only 3 get paid

2 tables both with 5 players blinds are 40 80 and go up every 20 mins

I have 77 in bb, folds to button who opens to 250 I have 2100 ( circa 25bb) and jam He calls with AJ and I lose

This play seemed fine ish but I also felt I had a small skill edge on the field so perhaps didn't need to play so aggressive. Was this a punt and if so how much ?