20ga 2.75″ Corona #6 Shot

Based on the search results, there is no direct product listed for a “20ga 2.75″ Corona #6 Shot.” However, the search results indicate that Sellier & Bellot (S&B) produces a “Corona” line in 12-gauge, while other manufacturers offer 20-gauge 2.75″ shells with #6 shot, such as Winchester, Federal, and Rio. 

Here are the details for common 20-gauge 2.75″ #6 shot options found:

If you are looking for a specific European brand, it is possible the “Corona” brand is similar to the Sellier & Bellot options mentioned in the results.