by Gwion » 08 Apr 2015, 8:53 am
Sally. Theoretically 1moa is as described above and 0.5moa is better (i for one need all the help i can get from my rifle). A rifle that shoots 1/2" at 100 wont always shoot 1.5" at 300 though. Many variables like bullet choice (BC), velocity, barrel twist etc, will effect accuracy over range due to projectile stability: how long does it take to stabilise and how long will it remain stable. All this before you consider wind, angle, etc. All these things need to be set up with intended range and target in mind. For instance, my 223 can shoot pretty damn well to 300 odd yards but i shot it at 600 (range shooting) for the first time recently and it was right on the edge of its limits (mine too) and even with little to no wind it had a 2-3moa variation in elevation, or maybe more. The light little 50gn bullets just lost too much velocity at that range and had gone trans-sonic. With a faster twist barrel and heavier/longer bullet (better BC), it may have been more consistent. Also, a light barreled hunting rifle might look at 3 shots for testing accuracy before heat may cause the barrel to "whip" a bit more (or differently) and open groups up. A heavier barrel will be less effected. So with load, cartridge, rifle and skills all set up for intended range and target, yes, a rifle that shoots 1/2" at 100yd will shoot 2.5" at 500yd.
So, that's the rifle, this next bit might be a bit off your original question but: for hunting accuracy, you may find it helps to practice how, where and when you are going to hunt. That is to say get to know your location, rifle and terrain. If you have access to a place to hunt, go out and have a practice session or three there, or somewhere similar. You will find out what the wind does, what the light does, what angles you are likely to be shooting, what cover is usable for stalking, what is available to use as a field rest. Practice closer offhand shots, longer shots with a field rest. Use some targets that are easy to set up and take down and place them at various ranges/shooting angles. For example, set one at about 30m, one at 50, one at 110 and one at 200. You might practice standing off hand shots at 30 & 50m (i'd go a 22lr for this until you can ping it easily), sitting/kneeling at 50 &110, and a low/stable field rest at 110 & 200m It will all be a lot different than shooting on a range or clearly set out target.
Some might say it's a waste of a trip or ammo or whatever, but once you can set 3 or 4 targets in the field and ping them first shot you will be much more prepared and confident and accurate of all ranges when you actually go out for a real hunt because you will know what you and your rifle are capable of.
My rifle can shoot 0.5MOA and so can i under comfortable, calm conditions but as the BigFella says, the first round out the spout needs to hit the kill zone. In one outing i've been known to take a head shot at 200m but then completely miss a chest shot at 75m. Why? I had been practicing too much at a set range with a nice, comfortable, set rest. Good for practicing fundamentals and working on rifle accuracy but no help in improvised field conditions. So, i started collecting empty cans, filling them with water (stability in wind and fun exploding can factor) and setting them up at various ranges around the paddock i use for practice and shooting as described above. It helped a lot.
Work on your skills and learn your limits for range with various rests and stay with in them.