Shotgun range is shotgun range. 28's shoot at the same velocity as a 12's, you just don't have the same amount of lead. Remington Express 28ga shoots 3/4oz at 1295 fps, Remington Express 12ga shoots 1 1/4oz loads at 1300 fps. 3/4oz of #6 (that's what I'd shoot at rabbits and squirrels) 135 pellets, 1 1/4oz of #6 281 pellets. A pellet from a 28ga is as effective as A pellet from a 12ga. What's your effective range?
Folks mistakenly tend to use "rifle" rationale with shotguns, bigger doesn't mean more power, just more lead.
BTW, I prefer Remington ammo for the 28. !oz loads are available in other brands, but I understand that they don't pattern very well and haven't tried them.
You'll enjoy it...
>>>===> Dave