Great responses, cheers guys. To those who use saws without jigs/guides, how do you go about the cut? Do you clamp/hold the billet with the belly down & back up, so the billet is horizontal and cut looking straight down, or do you hold the billet vertical and cut so that you're looking along the length of the billet?
I found that cutting with the billet horizontal messes up the most, but I am doing it without the correct tool it would seem.