You don't give enough credit to how well SSK barrels hold value IMO Chris, and as you know I've owned and resold a bunch of SSK barrels. A seller certainly doesn't need to discount either them or a Leupold scope 50% when used if still in great condition. I wouldn't sell that package for $500-600 no matter what, and not even approaching that low unless it is in well used condition that really shows it.
Do the math on new prices today... almost $1100... then discount for its honest condition and the useage you got out of it to come up with a fair asking price.
$450 barrel
$100 T'SOB (if its a quarter rib, $150 if full length)
$125+ Break
$350 Scope
$70 Dies
HTH