I've seen guys do this and I've tried it a couple times myself and it seems to work wonders to reduce felt recoil when sighting in a medium or big bore.
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<br>The trick is to attach a piece of strap to a heavy sandbag, then loop it around behind the butt of the rifle and between the butt and your shoulder contact. The rifle will act normally for the shot, but will need to push you and the sandbag back during recoil, lessening the recoil on your shoulder a bit. I've never noticed a POI shift doing it this way and it sure can save your shoulder during a long day of shooting. These days, however, I prefer to use a PAST Magnum pad to do basically the same thing without the hassle.- Sheister
