Welcome aboard Laurent. I am not sure how "nervous" or "skittish" Roebucks are. But if they are like Whitetail then you should stay close to the 30 to 35 yard mark so the deer do not jump the string, they are fast and any sound they can act faster then you think. Some guys do 40 on calm deer and are ok, but it gets to risky after that. If Roebucks are like moose and are on the dumber slow side then you could be good out to 60. Moose don't care what is going on and will stand there and watch a guy take aim and wait for the arrow. If Roebucks are not as skittish and are more like a moose then longer shots will be ok, But if like a Whitetail, keep it close. Also behind the shoulders is always the safe shot to do, a deer will not live with two holes in its lungs. If you hit shoulder then you may only get one lung and they can run a long ways before laying down to die. Also arrows kill by blood loss and your .243 kills by trauma or damage to tissue. The shot or a bullet in the neck anywhere drops a deer from the massive impact and breaks the spine. With arrows, unless you hit right on the spine the deer will be able to run. If you miss spine directly you have to hope you hit a main blood vain, other wise deer could go a long time if you did not hit one of those two. So gun is ok, but Bows is not for neck IMO. Hit the lungs and you will be good to go. Experianced guiys take risky shotsa all the time, but I would keep it in the safe zone for a New CB user.