Just wanted to up date this post. I have been busy with family and have not been to the range at all this summer. I did sit down and figure out how far I could shoot with the PST.
I have 58 MOA's of adjustment left after mounting the scope on a 20 MOA base and a set of 10 MOA Burris rings. This will get me to around 1700 yards, and with the 10 MOA'S of hash marks, this will get me close to 1900 yards.
Now this is all done on a ballistics program at gseven.com and I have not field tested it yet. Once I get some dies for reloading I will be doing some more shooting and drop chart development, and testing out some new AR 450 steel targets.