Well, I wouldn't recommend it on a bow that meant a lot to you. That being said I have done it many times. In fact the bow I shoot the most, a 1961 45# Bear polar that I pull 30", has had a 450+ string on it for about 8 years. I've shot it probably 20,000 times with arrows of about 10gr/lb. I even had an arrow nock break and dry fired it once. I also have several other vintage Bears I have shot a lot with similar strings with no problem, but all the real nice ones get dacron.
Why do it? Well the 450+ string is at least 10 years old (used it on another bow prior to the polar) never needs to be adjusted for brace ht. shoots about 6fps faster than dacron and on this bows is just as quiet ( that is not always the case on many bows). I also use ff type strings on selfbows some without tip overlays. Also on several bows ff has reduced handshock/vibration. Maybe I have just been lucky and as soon as tips start shearing off I'll repent and go to dacron.
The only damage I have done, due to dry fire with 62# bow, was with ff tips on custom bow, cracked tip overlay which was replaced and bow reverted to dacron.
This is just my experience and not a recommendation, I have a lot of bows and was willing to chance it.........McK