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I have one. It does not work that well when loaded to full capacity. Prefer the 8rd model, I have 3 of those. IMHO the best reliability is experienced when either the 8 rd or the 10 rd are loaded to only 6 or 7 rds. Odd but both type work fully loaded when using Remington Yellow Jackets.
Does the nose of the round hang up on the magazine? I was watching a vid where the guy had an aftermarket mag and it had a small radius removed to help the first rounds feed properly.
The Yellow Jackets have cone shape bullet so that might help it feed better having that smaller nose diameter.