I have the inside cleaned about every 3-years, depending on use, i have mine stripped, cleaned & generelly checked over.

If I've taken the gun to africa and used it for a couple of weeks, i'll accelerate that timing... primarily b/c of that dust over there - you'd be amazed at where it can get.

is that too often? maybe, but i wish that some of the old-timers before us had felt the same way i do about their guns at the time. if so, we'd have DR with "Excellent" bores... instead of pitted ones.