I've been using a Bushnell the truth range finder for the last 3 years (archery). My wife bought me a sig kilo 1000. I tested it out on my back yard range, I was off by 1 yard at 20 the 2 at 30 and it kept on going. My question is, the truth is supposed to be a range finder for archery. Which one should I trust? I plan to use the kilo of rifle only.