It is a good cartridge I have the similar wildcat made by Dedicated Technology called the 6MM DTi .
It's the 6.8SPC with a 30 degree shoulder necked to 6mm and it's a nice round running 75gr VMax at 3275fps from a 22 inch barrel. The Hagar is designed to shoot the heavier bullets but the DTI is good if you are looking to shoot the 85gr or less bullet weights. Mine is a Predator rifle but I have shot Axis/ Whitetails too.
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."
Jack O'Connor 1963