ok cool. The flask is a good tool and the rings are a good sign. As stated above your problem might be the primers.
You can also try paper cartridges. The paper isolates the powder from the primers. You will still need to grease it. Also it speeds up your reloading time on the range.
You can also try paper cartridges. The paper isolates the powder from the primers. You will still need to grease it. Also it speeds up your reloading time on the range.

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