Saboted slugs seem to be more sensitive to barrel residue than lead 1oz rifled slugs in my experience. Your results seem extreme but possible. I've only seen about 1-1/12" group variance through rifled barreled shotguns firing saboted rounds. Since you stated the $1.50 price tag I assume you are refering to sabotted slugs. You are using a rifled barrel for these aren't you??
Rick
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"I wont be wronged, I wont be insulted and I wont be laid a hand on. I don't do these things to other people and I require the same from them." -- John Wayne *The Shootist*
Rick
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"I wont be wronged, I wont be insulted and I wont be laid a hand on. I don't do these things to other people and I require the same from them." -- John Wayne *The Shootist*