What makes a rifle accurate varies somewhat on the type of rifle. A bench rest rail gun, while extremely percise (which is a better term), would not be appropriate for hunting big game in the mountains. So what you will use it for will make a difference on what you need. If you intend to have a custom rifle built, consider one of the custom or semi custom makers that sell packages. Blue printed action, Match grade barrel, Pillar bedded, Rigid stock. The optics you put on it will play a big part. A 36 power target scope will help shoot small groups but wont be worth a bucket of spit on a deer hunt. All of these can and will effect percision. All that being said, luck also plays a part. My bother in law purchased a Savage .223 that shoots like a house afire and yet was very economical. I have a .300 WM Remington 700 with a hunting weight barrel I bought at a pawn shop that has printed multiple sub .5 inch - 5 shot groups from the bench. The last but not least contributing factor is the feller behind the gun. If you don't do your part, the most percise rifle in the world wont shoot straight. I probably didn't answer your question, but what you are looking for needs to be narrowed a bit. One rifle wont do everything. But that's a good thing. You can buy more ;-)
