Question for you Tonkin - Do you have a scope on your gun or do you plan to use open sights?
I bought an Omega Z5 in October. My experiencewas that I could shoot great at 50-75 yards with the fiber-optic sights that came on the gun, but the front sight obscured too much of the target (in my case deer and coyotes) beyond that distance. For that reason I mounted a scope.
If you plan to mount a scope I would most highly recommend the Talley one-piece mount custom made for the Omega and Encore. You can order direct from Talley for about $55.00, which beats the heck out of what TC gets for their mount and rings (about $100.00) which are inferior to the Talley system.
Check it out:
http://www.talleyrings.com/al.htm
I choose the simple path as far as bullets and powder: 100 gr 777 pellets and 250gr Hornady SST bullet/sabot (identicle to TC Shockwaves - Hornady makes them for TC). Good accuracy and so far great terminal performance in the one deer and one coyote I've taken with them so far. Good luck.