Welcome Robert, and congratulations on your new treasure. Please look through the FAQs, esp. http://www.lcsmith.org/faq/safetoshoot.html None of us can (should) make an internet diagnosis and ANY vintage double should be cleaned and examined by a specialist smith before use. Part of the evaluation would be to check the head of the stock for cracks and possibly glasbed the wood. This would provide confidence in using any standard target load. He could also check the choke constriction.