Looking at your deal and running my numbers (I also use hard money that lends at 70% ARV, 13.99% interest and 4 points), you would need to get the purchase price down to at least 230k, preferably even lower in order to get the HML to fund the full repair (assuming you can even find one that will do 100% purchase and rehab there).
I have spoken to a lot of people doing deals in Atlanta and I know there are some pretty cheap properties there that make great deals. If this is your first time doing a deal, I would STRONGLY recommend taking on a smaller project first to get some experience before tackling something this large. The bigger the project, the more room for things to get ugly, and you dont want to be stuck with a mess on your hands from biting off more than you can chew!
I say all this coming from experience of course...been in some rough situations myself. As far as getting the deal vs contacting a HML first, always get the deal first, as you'll need that to even apply for a HML loan. Definitely do some research though and find one that fits what you're looking for and what you might think you can qualify for. You can find whole lists of Hard Money Lenders in your area right here on BiggerPockets. Always look for a local lender rather than national, as they usually have better rates and are more flexible. Any questions, feel free to inbox! Good luck!