Can't be a lot of difference between the Gold Dot and the XTP loads IMO but then you can also look it up on the Hornady website or contact Hornady and ask them via email. I have found that all of these companies are quite happy to provide data if they have it for you.
I'd say email would be better, they are no doubt busy. Email and wait for it to happen. They will get back to you in time.
A phone call will take you a long time waiting on hold likely an then you will have to write it all down.
They may not even give it to you on the phone, a lot of places won't since they may make a mistake reading it and they are liable if they do.
EMAIL them and they can send it to you as it is probably waiting in a PDF for that bullet and you will get all the powders and all the data they have for it.