Free: Contests & Raffles.
Yeah hold out for a bull the whole time. It'd be your luck that you'd shoot a cow and then the big boy would come out. I'd rather regret passing up a cow at the end of the season than shooting a cow and thinking i might of had a bull. Good luck!
It would depend on what tag you drew for what to hold out for point/score wise imo... I'd leave the cow tag in the truck/camp till your last day out....