I have a Model 12 Benchrest in 6BR and it seems rather sensitive to changes in the sandbags. The rifle has a 29" heavy barrel (making the gun muzzle heavy), and the buttstock might be jumping in the rear bag. The bag is a Protektor Deluxe with mid-ears. Are there any rules of thumb for how tightly packed the sand should be in the bags themselves and the ears of the rear bag? I'm not a bag squeezer, but I don't know if the bags should be hard as rocks, or a bit more squishy. I will be buying heavy sand as soon as Sinclair can ship it.

Any suggestions?