All I know is I have fired several thousand rounds thru various 700's over the years with out a hitch. I have seen one failure to extract in the field in my years fooling around with guns and that was with a sporterized mauser that jumped the rim.It belonged to an acquaintance that was on a bear hunt in Canada. Of course he had no cleaning rod with him. It was bit-- getting the case out after that but I finally managed to get him back into service. Do I condemn all claw extractors? No but I am not as enamored of them as most as I find CRF to be more trouble than they are worth and a remedy for a problem I don't have and probably will never see. I have a couple but I don't chase sporting rifles because they are CRF. A 700 extractor is OK by me.