Well, you didn't say what part of Oklahoma you're in. Check OFGC.org
Old Fort Gun Club. Located in Barling, AR (east Ft Smith). They hold two matches a month on silhouette and they shoot metrics. I shot silhouette for several years with a club that's no longer around, but that was NRA standard. Anyway.......look up the match director for the small bore. I am a member of OFCG, and don't quote me on this...but I believe any scheduled matches are open to the public now. If you need more information than what's available on their website, I'll help you any way I can.