On the theory of short actions being more accurate, I doubt you'd ever see any difference whatsoever between long actions and short actions in a hunting rifle. In a rifle built for benchrest shooting that is capable of putting 10 shots in the same hole at 500 yards, sure there may be a discernible difference between a short and a long action, but not in a rifle made for hunting that at best only needs to shoot 1 inch groups at 100 yards. JMO
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I mostly agree with you; by far the biggest factor in accuracy is the person squeezing the trigger. Its the most common fail-point and the hardest thing to keep consistant. But not all hunting rifles are created equal. Some hunters are satisfied with hitting a paper plate at 200 yards, and every factory rifle will do that. Others want their hunting rifles to shoot like full blown benchrest rifles; sub moa. And thats when everything must be taken into account and the factors have to narrowed down to be consistant.