There isn't an Avon Park range listing that I could find. The range is located in Highlands County, and even the airfield, which is called MacDill Air Force Base Auxiliary Field (KAGR is the locator) isn't on some of the charts/maps that you might see.
You are going to have to create your own Favorites list and hand-key the frequencies.
Here are the "primes" for the Avon Park Range:
Avon North Tactical 264.625
Avon South Tactical 276.600
Avon Range Control 292.200
ZMA Miami Center Avon Park Low 317.750
There are always other frequencies in use there by the individual organizations using the range, so searching 138-144 MHz (AM mode) and 225-380 MHz is vital.
This is just to get you started, I'm sure others can chime in with more detail, if not, message me and I'll point you in the right direction.