Hi veektor,
The bolt should close all the way when a round is chambered.
Have you checked the chamber for any obstruction or some foreign object lodged inside?
Have you tried pushing the cartridge into the chamber manually? This should be done by assembling the cartridge using used caps, not live ones. Push the piston down to the bottom of the cartridge. Will it enter the chamber correctly?
If not, then:
As you have a mixture of cartridges, they may be the incorrect type for your model. If my memory serves me correctly, Hudson produced 2, possibly 3 different cartridges. I believe they all used 2 caps per cartridge. Have the cartridges been loaded correctly?
The detonator pin may be of incorrect length if it is not the original factory pin. Although it's difficult to imagine why anyone would install a pin 1 cm too long. Perhaps a previous owner was attempting to use single cap loads and made a longer pin?
Please let us know what you find. Photos would be very helpful too.
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.