Cop----listen to Lemoyne, he KNOWS what he's talking about!!!!!
I just got my Triumph sighted in about a month ago. I have a Nikon Omega ML scope with Nikoplex reticle (regular crosshairs).
My gun is sighted in at 150yards. I use TC SW 250gr, Harvester Short Black sabots, 50+50+30 777 pellets (130gr), and CCI primers.
If you are NOT using CCI primers..STOP and go get some. They are by FAR better than 777 primers. I've tried a lot of configurations with my Triumph. The above listed is what my gun likes. If you do not get good results with the 777 Magnum pellets, try what i am using; I don't think you will be disappointed.
There is a lot of good info on this site!!---DrAsus