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My experience with the 12 benchrest is the same as your's. The gun is most definitely floating in the rear bag, due to the nose heavy situation. Yes the 12 benchrest has another problem as well do to the height of the action and barrel in the stock it torques, and moves the same in the front bag. I found that the best way of shooting this rifle was to take my no-trigger hand and lay it on the back of the stock and place pressure done on the back keeping the stock in the bags. Many have flamed me stating that I was full of it when I made the same claims as you.
On heavy sand forget Sinclair's. Call Protektor direct they sell it for a dollar a pound, and if you have it shipped to a FFL they will pay the shipping cost. The bags should not be rock hard, it will affect the way the gun rides in them. The IBS rules only state that "The rear sandbag shall be a bag, or combination of bags containing sand only. Zirconium silicate, known as “heavy sand”, is allowed. No other metallic sand will be used by any competitor. A vertical spacer under the rear bag will be allowed as long as it incorporates no adjustments for windage or elevation. The vertical spacer shall not contain any protrusions, which can be inserted into the bench top or the sandbag. The rear sandbag shall not be contained in any manner. The rear sandbag cannot in any way attach to the front rest."
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