Another cause if a "double-feed" is one where a live round is trying to occupy the same space as a spent cartridge that was not extracted (FTE). Then you have an extractor issue unless the rim of the spent cartridge was ripped off by the extractor. In that case you might have a chamber issue that is causing the case to stick (i.e. Laquer from Wolf ammo, rough chamber, etc.).
Good luck!!
We must not believe the Evil One when he tells us that there is nothing we can do in the face of violence, injustice and sin. - Pope Francis I
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