There was similar equipment on that site not too long ago, which I think the general consensus was that it was from the (then recently) defunct Lanes...
I have no personal experience of this model but, as Neil says, would guess that the swept volume may not be sufficient to achieve that sort of power...
Airguns don't really have a bolt in the traditional sense. I have a couple of bolt action .22LR which have a very satisfying clunk clunk, those with...
Ive tried five different barrels, choked and unchoked along with a big selection of slugs shot at various fps too but never found one that delivered...