My moneys on the hammer spring, especially since swapping firing pins made no difference. Switching ammo might make a difference, but who wants to be limited to a single ammo source. I had the same problem with my first Elsie, and all the right barrel would shoot was Winchester AA's (Expensive as heck, even back then!) I replaced the hammer spring, and it hasn't light struck a shell since.
If you're familiar with recooking the gun while disassembled, you can perform a quarter test. Remove the fore end and barrels. Stand the receiver on your bench with the breech face facing the ceiling. Place a quarter centered over each firing pin hole (heads side down). Pull the trigger. Each quarter should bang off the ceiling (if you've got 8 foot ceilings) or at least both quarters should fly not less than 36" to 48" high. If the trouble free side tosses the quarter noticeably higher that the problem side, then the spring is likely the problem. Ejectors will be ruled out since they aren't even in the equation for this test.
Be sure to re-cock the hammers prior to re-assembling the gun.
Hope this helps!
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