Purple heart is used by Merlo in his spearguns. Because of the weight, you'll have to make speargun's cheeks with a lighter wood.
With a good epoxy finish, almost every kind of wood will be good.
I'm building guns with oak, red cedar and mahogany. 1/2" of oak in center, 1/3" of red cedar on each side, and 1/4 of mahogany for the color, on each side. I think it will be good and well ballasted, because of the cedar. Still in construction.
So if those woods are good, be sure that your purple heart will be very good, and great looking.
With a good epoxy finish, almost every kind of wood will be good.
I'm building guns with oak, red cedar and mahogany. 1/2" of oak in center, 1/3" of red cedar on each side, and 1/4 of mahogany for the color, on each side. I think it will be good and well ballasted, because of the cedar. Still in construction.
So if those woods are good, be sure that your purple heart will be very good, and great looking.