The "Vne" limit is aircraft orientated, not load orientated.
The UK military use an Air Publication (1105? It's been a long time) issued by a specialist unit (JATE, used to be based at Brize Norton in my time) which flew USL trials and issued a clearances for specific loads, giving detailed rigging instructions and any limitations, warnings etc.
Some dense, heavy underslung loads we used to fly under the Puma would do 120 kts plus. Trick was to get the "mutual support" Wessex pilot to call "Buster!" on the Tac radio, meaning he couldn't keep up - without an underslung load!