hi
what i m reading atmo suggests your campbells where campbells of duntroon who bought raslie,
in 1590, although the spelling of raslie comes in many forms ie rashillie and so on, there is a link to the earl of argyll buying property,
this info is from kilmartin land assement,
attaching a clip about raslie,
and a pic of your castle at duntrune,
duntrune is slightly west of kilmartin but well within walking distance
with a good pair of boots,