I have used the Copilot programme on my Zire31 for a couple of months and it is great for W&B.
You can enter any specs for any helo with a bit of effort and time. It will plot your Long W&B.
I have it for the Astar, Bell 206 series and the 500. Great little programme. Also have a coversion programme for fluids and volume which is handy when the brain forgets stuff...