Ok, time for an update: I tried some white box Winchester, and it was close but no cigar. The toggle will almost close and the cartridge will be seated against the breech face, but it still leaves about 1/16" to go. I hand fed the cartridges to study their way to the chamber, and found that it was a bit of a rough and "wiggly" path. I don't really want to polish or reshape the feed ramp, but that might be what needs to be done. I'd probably be better off trying a new recoil spring first.
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