There are a couple of ranges in Pa that I belong to that have 1000yd capability.
They have some fun shoots for everything from 22 rifles to 17 hmr to sporter center fires to bench guns out to 500 yds.
Read the rules for the groundhog shoots and decide which guns you would like to participate with. I will probably go several times next year so if you need a ride I could swing by and pick you up.
Membership for driving up and shooting using the range on other days is $25 per year. It is where I go to get dialed in for 1000yds.
There is also the Williamsport 1000yd club which is benchrest but for $30 you can become a member and use the range. Long drive but you are closer than me. Their website is down at the moment. You can also shoot anythng you got in their matches but it is 10 rounds in 8 minutes which will warp a light sporter barrel into a pretzel. Your gun has to be really heat stable to stay on the paper at that rate of fire.
My advice would be to get some small caliber gun shooting well and go to Mifflin and try dialing and shooting and shooting and dialing. It does not matter whtether it is a 22lr or a 6mmPPC -the principle is the same. Accuracy, BC, trajectory, scope repeatibility, trigger,etc.
The other place that has some fun shoots is South fork
Experience is the best teacher so get some with paper.