Hunterbuilder, good shot! Considering the small shot (probably #9) packed in those shells you have to be fairly close.
However, technically you could get a ticket for using a handgun. The regs say shotgun and .22 only for forest grouse, be careful.
Forest Grouse
Forest grouse may not be killed with
any rifle or handgun 24 caliber or
larger, or shotgun containing slugs or
buckshot, during modern firearm deer
or elk seasons unless appropriate
deer or elk tags are in the hunter's
possession. Forest grouse may be
taken with shotguns as well as firearms
smaller than 24 caliber during
the entire grouse hunting season.