Halfadouble,
A .264" barrel is a real advantage and I believe it will be worth your time to take the project up again. Having to inside ream ( preferred) or outside turn the necks of cases formed from 9.3X72R cases is a disadvantage, but it only has to be done once, so in the overall scheme of things it shouldn't be a big problem. There is a (I think) mistaken impression that the Heeren is ugly or odd which sometimes affects it's desirability, but it has withstood the tests of time and I would be happy to own one. You might discuss scope mounts with New England Custom Guns. Good luck, have fun.
Mike
