Canon,I had brought this up originally in connection with my .257AI and in that instance the filing will be necessary.I thought about the rebated rim after I had posted my last message.The 338 has my attention right now.It wouldn't have occured to me to use the headstamp lettering as a reference.It seems the larger circumference of the ultra may be expected to expand more than an 06 for instance at the same pressure,same hardness of brass,etc.,or am I thinking backward? In other words,does .0006 have the same meaning in either case? Thanks again.
