Side note, it's easy to keep track of round count if you have separate bricks of primers for each rifle.
SamO I used that trick to keep tabs of total round counts annually. Not for individual barrels.
I had quite a few rifles running constantly.
Laker I would guess my Mashburn has about as many rounds as yours.....app 700?
Really no idea how many rounds a Mashburn takes. Still have my original tube.