Excessive HS in an old rifle can sometimes be mitigated in the reloading process. You do this by backing off on the resizing die so that your reloaded ammo is better fit to the chamber. Start by loading a dummy round (no powder, no primer) with the size die backed out to just kiss the ram. See if if chambers easily - if not, work down from there.
Since your 30-30 factory ammo appears to fire OK - you "might" have actually created a HS issue by excessively sizing your reloaded brass. My experience does not include headspacing or even using a case gauge (a must to have if not the Hornady tool I mentioned above) for rimmed brass. Seek some guidance there - possibly on a C&R forum.


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