obstruction award after dead ball

[shipwreck]

All rule sets that I am aware of state that when an obstructed runner is tagged out before they reach the base that in the umpires judgment they would have reached had there not been obstruction, you call dead ball. My question is in Fed ball where do you place the other runners? I am talking about runners that were not affected by the obstruction. The NCAA rule book is very clear on this. It says if the runners are at least halfway to the next base, you give them that base. There is no mention that these runners need to be affected by the obstruction in order to award this way. Fed rules say I believe, after the ball is called dead, you award the obstructed runner and all other runners affected by the obstruction, the base they would have reached had there not been obstruction. Like I said earlier, what do you use as a guideline for placing runners that were not affected by the obstruction. Rule reference also please.

Dave