I would look at the sendero as it is made exactly for your purpose which is taking big game at longer distances.It is available in stainless fluted and the ones I have shot have been very accurate for a factory rifle.As for the distances you intend to shoot I would encourage you to practise at long distance targets and to shoot at game only at the distances that you can consistantly hit targets at.To become proficient at even 400 or 500 yards requires a great deal of practise on a regular basis along with a good quality rangefinder.You should decide just how much time and expense you are willing to put into developing your skills to the level required to shoot at longer distances before spending the cash to buy the equipment necessary for long range shooting.Many people would like to shoot at long distances but do not have access to a long distance range and won't spend the time and cash necessary to shoot several hundred rounds a year practising to maintain their skills.