Update: Went to the range today to see how my Remington 7400 30-06 autoloader would do with the Sims Barrel De-Resonator and (after loosening the forend stock's screw to just finger tight) achieved the following results: August 5, 2005 12:10pm - No wind, but 94*F. Target Distance: 100 meters Ammo: Federal Premium Vital Shok 180-gr. Nosler Solid Base Results: 4 shots within 5/8" from center to center. Previously, with no Barrel De-Resonator and the stock's forend screw very tight: June 2, 2005 10:30am - Slight East to West wind, and 81*F. Target Distance: 100 meters Ammo: Federal Premium Vital Shok 180-gr. Nosler Solid Base Results: 4 shots within 1 3/4" from center to center Seems that these two small adjustments cut the groups in half. The $19.95 Barrel De-Resonator was installed about 7/8" in front of the stock's forend screw, which seems to be the magic spot on this rifle.