The shop where I used to work does Remington factory repair work. We do over 1,000 repairs annually but certainly not all on 700's. In the last 5 years I cannot remember a single 700 being returned for not enough primary extraction. While there is almost .100 available if everything is set up perfectly, you don't need .100 of primary extraction, if you do then you have one of the worst chambers ever installed. My Barnard for instance, has only .045 primary extraction and it has never failed to extract a case. As Dusty said, you can pull a Remington bolt back and clear the locking lugs without hitting the primary extraction cam. If extracting a fired case the bolt does not come back when it clears the locking lugs, it will continue closed on the case until it hits the primary extraction and then start to extract the case. Flame away if you like but I cannot get onto the "bash the Remingtons" bandwagon just because everything isn't set perfect.