I hope the H460 isn't really that slow !
A PHRF of 108 for a modern 46 footer with a 39 foot waterline does not reflect well on the designer. Using the YRA-LI list, this puts it right at par with smaller boats such as the Jonmeri 40 (105) and Catalina 42 (102). It suggests that H460 sailors will see the transoms of quite a few venerable designs with shorter waterlines, such as the Stevens 47 (93) and Swan 40 (90). The ratings of modern cruising designs, such as the J/42 (72), suggest they'll leave you in the dust. I hope, for Hunter's sake, that this initial rating is generous, and that you clean up on the race course.