Take a fired casing, use a pin punch to drive out the primer, then place it in the chamber. Pull the trigger and let the bolt go forward. If the extractor doesn't pick up the casing, your chamber is probably already too deep and reaming it won't do anything but make it deeper. As mentioned a couple of times, your problem MAY be in the snap caps you are using. They don't work well with guns that have fixed firing pins.
New Sten Gun owner questions.
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