You may have a weak hammer spring and/or thicker than normal primers. Also check for excessive headspace. Find a 30-30 headspace gauge. Since 30-30 headspaces on the rim, any 30-30 gauge should do. If no headspace gauge is available, place one thickness of black electricians tape on the head of a factory loaded 30-30 shell and trim it to the same size as the face of the shell head, and close it in the action. Keep adding one thickness of tape and try to close it until it won't close easily. If you've have to add more than 2-3 pieces of tape, you likely have excessive headspace.
That's a bummer because 30-30 headspaces on the rim head.
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