Are we talking about the 12ga Law Enforcement 438gr Truball Tactical? If so I took that to the range once, and after 5 shots in my 12ga SA, I thought I may have left too much grease in my barrel or action...it wasn't so much smoke that you think the Vatican just picked the next pope, but it's definitely more than the typical Rem Sluggers or the Score Low Recoil Slugs. Even the el cheapo Challenger slugs don't do that. I haven't used them since, but I have hundreds more boxes of these (bought at one of our site sponsors) so I should try these again to see if it's a feature, not a flaw.