Well, I can't comment on what others do, but if I'm out on the prairie I'll be prepared for a long shot by having a pack on my back, even if I don't need the stuff in the pack except to use as a rest. And if I'm prone (as TAK specified) I'll be using the pack as a rest.
Which is of course off the subject.
The pack will usually work fine, but problems sometimes arise when one is crawling. In little to no cover situations, to keep a low profile one must push the pack in front of oneself, as the act of removing the pack has been known to cause enough movement to run off game. Simultaneously maneuvering the pack, rifle, and trying to keep the cactus penetrating one's tender bod to a minimum is sort of a pain. The easiest way around all these problems is to simply attach a Harris bipod for no cover prairie duty.
Again, off the subject, but hey, if threads always stayed on topic, most would be two pages long
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