Checking the TSRA web site
http://www.tsra.com/NRA_Sub.htm I see one club in Jacksonville Florida shooting High Power Silhouette on Jun 7, Jul 5, Aug 2, Sep 6, Oct 4, Nov 1, and Dec 6. The contact listed is M. White, 1238 Le Brun Dr., Jacksonville, FL 32205-4552. (904)786-8115 or mel129byrd@aol.com
A hunter class rifle may not weigh more than 9 lbs including scope, and the trigger can not break lighter than 2 lbs. The barrel must be tapered (no "bull" barrels), and no muzzle break. The caliber has to be 6mm or larger, not a magnum, and not a wildcat.
There are also restrictions on dimensions of stock, length of barrel, and height of scope, but as long as it looks like a standard hunting rifle you are probably well within these limits.
Your 6.5 Rem Mag would not be allowed. But the 6.5 x 55 Swedish Mauser and the .260 Rem are both very popular, as is the 7mm-08 and others in that general class. The idea is to have enough power to knock over the rams, but light enough recoil to still be shooting well at the end of the match. You do not need a "flat shooter" because all of the targets are at known distances. If you already have a non-magnum hunting rifle anywhere from a .243 on up to a .30-06 bring it out and give it a try.
A 6 power scope may not be a good choice, but if it is what you have bring it out. Most (but not all) people use a lot more power. Target turrets are an advantage because you will want to adjust your elevation for each of the four distances.
- Jim