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The event is open to anybody.
The Spring League matches are also open to anybody.
I'm not sure where the reference "minimum caliber" came from.
Generally, nobody shoots .22 rimfire at these events, although there are a few persistent souls who shoot so badly, they might as well be shooting .22 shorts.
Most people shoot AR-15, but there are still a few brown guns that show up on the line.
Your Garand will fit right in.