Same here, however, have more rounds down range through my replacement bolt (same lot as the first bolt) than I fired on the first bolt, so looking like working out for now. For the next generation bolt (in particular the extra one I am ordering), I might wait until you guys put a few cases of ammo through your "next generation bolt" as will be too cold up north anyway, unless luck out and get a warm and/or low snow winter (friends ranges are half mile back on the farm so wet or deep snow is bad ... or down a steep shaded hill, so snow and ice can mean staying the month ;-). You know this time of year in the Midwest, Global Warming can be a good thing for shooters ;-).
My take from limited knowledge and in connection with your comment on the "next generation bolt", it that the vast majority of bolts were fine, as indicated by a many shooters having tens of thousands of rounds fired, and just a few bolts from a small lot (which the three of us might be the bulk of the failures or possible even the only field failures) had issues with the hardening. While at times the end user would wish for no changes in process, in fact any manufacturing process tends to be an on going process with small improvements trying to get the most wear/life possible for shooters etc. It sounds like the next generation bolts should be better than the old bolts with the old / initial hardening process that are currently working fine and thus a long term improvement. Again this is my take from general comments and should not be taken as fact.
