Yeah mine was back in the 80's too
Dunno about the power, but I put a dart through my bedroom door with one (early egg box door) trying to hit a bluebottle.
Missed it but got the bugger later with my rangemaster .22 in the lounge My ol'e man went mental with me.
Ahhhhh "Youth huh?" them were the days, Im much to sensible since I got married
Tony