Just went over 2200 rounds this weekend in my 300 WSM
. Shot two 7" 10 shot groups at our matches to win relays.
Front of chamber neck is gone and has firecracking about 4-6inches up past chamber.
Moved seating depth out a total of about .075 from original depth.
New 12" twist Broughton going on over the winter. Going to chamber for 300wsm with 187 BIBs in flatbase.