mickey,

...i appreciate the response...

...i am thinking of getting a heym safari express take-down in either .416 rigby or .500 jefferey as a replacement for a problematic ruger rsm .416 rigby...this would be my 'big bore' for anything that the 9.3 double could not handle...

...when i look at heym's website, i notice that the express take-downs also feature the same type of 'lugs' used on the dakota take-downs...this would presumably assist in the accuracy department as you have suggested...