Long ranges and wind are not favorable for air rifles. I used my Bantam Sniper HP in an event, and became aggravated with the amount of drift my pellets were experiencing as opposed to the 22 rimfires. The BC of an air rifle pellet is a significant disadvantage.
People who shoot off a benchrest think hitting a target at 100 is easy. And when you're not running around with an increased heartrate, or working to get off 10 shots in 2 minutes, AND engaging alternating targets, it is...
But a good shooter with a rimfire will run off and leave an air rifle in a typical NRL event - ESPECIALLY if it is windy. There are too many advantages for a 22 lr rimfire. Speed, trajectory, BC, etc.
And, don't forget that most clubs will have bonus shots for the rimfire shooters. Shots of 300+ yards. And it sucks standing around watching the rimfires hit steel at 350-360 yards and I can do nothing but sit my rifle down and watch. Anyone who says they can hit a 12x12 target at 350 yards with an air rifle, either got insanely lucky, or is lying. My rifle drops over 675 inches at that distance.
With that that said though... There is a significant advantage to having a high power 30 caliber for this event.
But... the airguns don't compete head-to-head with the rimfires. So... if you walk out there keeping your expectations in check - you'll have fun.