I followed the link to RockCastle Shooting Range in a press release I received. I noted on the front page they announced they are going to start shooting silhouette in September.
As of now, it is not an IHMSA sanctioned range. I have informed Greg of this and he is following up. However, it would be great if IHMSA shooters attended their matches to try to convince them to run sanctioned events.
The website for the range is here. RockCastle Range