You are good to go for all classes in NBRSA sanctioned events,
NBRSA Rule Book (New Sporter Rule)
B. Definitions: 2. Equipment (d) Sporter Rifle
A Sporter Rifle is defined as any rifle having a safe manually and mechanically operated firing Mechanism and must not weigh more than 10.5 lbs, inclusive of sights. The stock can be flat, or convex, but not concave. The Forearm can be any width and have any angle. The butt stock can have any angle including a reverse angle, the barrel shall not be less that 18″ long forward of the bolt face and can be any diameter or configuration including a straight taper or a reverse taper. The Sporter Rifle can be no larger than .308 Winchester. Sporter Rifles do not have to conform to the Varmint Rifles diagram. All sand bag rules apply to the Sporter Rifle.
View NBRSA Rule Book (Includes New Sporter Definition) PDF