On another board, I read that at least two members wrote that the metric thread on a Tikka receiver can have a 1.000-16UNF (or 1.0625-16UNF) thread on an American-made barrel threaded into it and torqued into place. Rather than getting into an argument over there, I'll ask here "How can two differing threads be trusted to contain the pressure of a high-pressure round being fired?" I mean would you fire that rifle, knowing the two threads in question are not compatible? I'm light-years from being very smart, but I'd suspect stripped threads on the barrel, in the receiver mouth, or in both places.