This video details how a deep cleaning process, inspired by Ron Spomer's advice, restored the accuracy of a Sako 90 Quest rifle. The rifle's accuracy degraded from sub-MOA to 2-inch groups, suspected to be due to fouling from lead/gilding metal bullets affecting all-copper bullet performance. After cleaning to bare metal using SC14 and a borescope, accuracy improved to an average of 0.64 inches.
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