Terry,
RCPRO Club 40 , starting last year, has 3 Classes:
Bronze (FP, LA, TT Bushing, etc. )
Silver - (.40 BB and the Evolution .46 nx with APC 9x6 )
Gold- - ( .46 BB)
In Indiana we run Bronze and Silver. As you are probably not running Bronze, you could run Silver and Gold. At the Nats we are running all three.
Ken