bill: your gun was not designed to shoot one ounce loads...better to stick with ammo gun was designed to shoot...

besides, huntable populations of grouse are pretty much a memory only, in the northeast these days...some pockets of birds are still left in northern maine...otherwise pretty much just a memory now...

if you do flush a bird in ny, dont shoot it...it could be one of the last ones...

keep it simple and keep it safe...