I am loading H-1000 with a 168 TSX.Great load!Called and talked to a Hodgdon tech and he says my load should be completely safe and within their pressure limits.I have worked up to 83 grs.If your careful and have a good chronograph you can probably do the same with the 168 CT.
I have a maximum load of 81.5 grain using Hornady 180 BTSP so you could start with that and work your way up. H-1000 is very stable powder. It's my favorite powder for my 300 Winchester Model 70 Laredo.
To achieve the maximum possible accuracy, all variables must be remove or at least minimize.