Of course a .5 moa rifle would be nice and the skill to get .5 moa out of it, but for general use a ton of medium sized game have been killed by iron sighted 30/30s cleanly at the ranges you are talking about. In my opinion, I am no expert, but I have killed a couple of critters over the years consistent 2moa from field positions is plenty good to get the job done. The key is making sure the majority of your practice is from field positions. Just like with an AR shooting a group off the bench is a very different proposition from shooting say a walk back drill.