Yep, I dry fire my guns quite a bit actually. I have done it, and had my daughter practice also, dry firing my 1911 .45. My hope is that by dry firing and learning to squeeze the trigger withoutmoving the sights off target, we're learning to not anticipate recoil. We learn by muscle memory to expect no recoil.
Its not a surogate for practice, but it has helped us early on with some of the issues we had.
Thats the long answer. The short answer is;
No. Not a no-no. You can dry fire an empty chamber. Again, I'm not familiar with the 464 so take my advice for what its worth.