For the Meridian, you can get an honest 250-250-250. 250 KTAS at FL250 on 250 PPH.
It's an awesome flying airplane. I also fly the PC-12 and the Meridian is like a Porsche compared to the truck-like handling of the PC-12.
However, it's a SMALL airplane. Weight is also very limiting. Top the tanks and you can take the pilot and 1, maybe 2 passengers. Even with the tanks topped off, you've got a range with reserves of less than 1000 NM.
If you've got specific numbers questions, PM me and I'll look 'em up.