what would be a good throat measurement when getting a 6mmbr rechamberd to 243 using lapua cases and Lapua 105 scenars, im trying to get a good measurment that wont have me seating the scenars to deep in case wilest keeping throat to rifling measurments not too long, Lapua state 2.689 oal with the 105 scenars, would say 0.020in throat to rifling sound good, also would keeping case mouth diameter 0.0001 or 0.0002 inches tighter help to improve accuracy, Regards paul T.