My two pence.

I agree probably just a cleaning up process. I have just checked Hege .44 ( yes vbull that one ) Hege Uberti .36 and three original Remington .44's and a Remington 1861 none of which have a chamfer. I am sure if Mr Hege had thought chamfers were required I am sure he would have done so.

Also agree chain fires are from badly fitting caps or the caps coming off, not from the front.