Yes , we could have full power air rifles , although most of my mates went for UK legal because we were shooting FT rules at our club .
It was a struggle finding decent pellets that would stabilize at higher velocity, its ok to shoot through a bib , but being ex military we were all about accuracy , not so much spray and pray .
I spent hundreds of hours at the loading bench and on the range perfecting tight accurate loads for my hunting rifle , and it was better ( read lazy )to just get a sub 12 ft /lb rifle and work up a good pellet / pressure ratio for max accuracy .