Ron, you don't need the stamped steel mag box, spring or follower. As long as there is a slot cut in the stock that will physically hold two of the rounds you're chambered for....you're in compliance for the IBS rules. On the 700's, a Davidson single shot adapter with some foam under it allows the follower to be moveable, per the rules. It makes it a snap to drop a round in and close the bolt.
The NBRSA rules are a bit different. You don't need a magazine cutout in the stock. Plus, the follower may be glued to the stock..basically the action drops over the glued in follower. The magazine cut in the reciever needs to be big enough to accept the loaded round you're chambered for.
The IBS rules for Hunter and Varmint Hunter class also allow for a bigger barrel than does the NBRSA rulebook.
Those of us lucky enough to live where we can compete in both IBS and NBRSA tournaments build what are essentially a sort of 'hybrid' rig: IBS rules for the mag. cut in the stock....but with the NBRSA Hunter barrel profile. This allows us to compete anywhere w/o issues.
Mike: the IBS has what's called a Varmint Hunter class as well as Hunter. Varmint Hunter is the same as Hunter but w/o the case capacity or caliber restriction...that's why the 30BR's can compete.
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As an aside:
It would be nice to see only one 6 Power class in the IBS (no case capacity or caliber rules). If the NBRSA Hunter competitors would also adopt this common sense idea, both organizations 6 Power programs would be much the better for it.
Good shootin'.
-Al
