I regularly use my BSA Lightning - and the rabbits, pigeons and squirrels that I've shot would definitely not say it's a toy (well, if they could speak anyway )
I also use a BSF Bavaria, and an HW95 - also both at 12 ft/lbs, and these seem to settle the pest problem fairly effectively too
Admittedly, if I could afford a PCP, then I would probably apply for an FAC rating, and get the power turned uo, but at the moment, 12 ft/lb does just fine