I think that A305 should be a family like A310 A300. Two PAX version will fill well the Gap between 321 and 332: there is enought space for this.
The A310-300 in my opinion is not a medium range, but a long range aircraft: for an European point of view it could easily fly from central Europe country (see CSA for Exemple) to Nort America East Coast.
It will be the rigt range also for europe - africa route and Europe - east route where 777 340 and 747 are too heavy and large.
Also A300 has decent range in 600 version (LH FRA JFK
of course nothing compared with 340, 777 or 747, but these range are only needed on pacific or far east route.