Both pistols are spring piston, and the specs speak for themselves. Aside from looks, the 45 has a choice of two velocities. But, has anyone owned, or even just shot, both models. I would be interested in any comments, particularly the trigger quality of each and the feel and balance, as subjective as that is.
I owned both. I still have the HW70, but my HW45 belongs to a thief these days. I replaced the 45 with an HW75.
Although the 45 and 70, are both springers they're quite different in the way they cock and shoot.
The dual powers on my 45 weren't useful to me because the points of impact were so different.
My 45 was too powerful to shoot from a bench because of spring bounce, and it's effect on the point of impact, but if you gripped it with a two hand, thumb over thumb gipp, you could rest your whrists on the bag and replecate your offhand point of impact.
My memories of the 45 are that it was powerful, accurate, and a quality HW product.
The HW70 can be shot from a bag with consistant results. The triggers on both were excellent, and adjustable, however I began experiencing a trigger issue with the 70 that I have yet to resolve. The sear releases and it fires but an arm in the trigger doesn't always release causing the gun to be unable to cock until you pull the trigger again. I talked with one other that had this problem, but both of our guns were of earlly production issue. So....
I replaced the 45 with a 75, because they're essentially the same gun physicaly, but the 75 is recoiless. I prefer accuracy over power, so the 75 was a no brainer.
I hope that helps.
All the best