Finally messed with the Rigby this evening.
Weirdest thing... the first shell ejected from chamber (with the 2nd being fed from the left side of the mag) doesn't eject clean and will often fall back in the raceway unless you're really reefing on the bolt. The 2nd and 3rd rounds zing right out without much effort.
What could it be? Worn ejector perhaps? Never had one do something quite like this.
Any help appreciated.