mˈɛni ɑːɹtˈɪlɚɹi pˈiːsᵻz wɜː kənvˈɜːɾᵻd fɹʌm ˈoʊldɚ smˈuːð bˈoːɹ wˈɛpənz wˈʌns tˈɛknɪkəl pɹˈɑːbləmz ɪn stɹˈɛŋθənɪŋ ðɪ ɚɹˈɪdʒɪnəl kˈæst ˈaɪɚn bˈɑːdi hɐdbɪn ˌoʊvɚkˈʌm.
Many artillery pieces were converted from older smooth bore weapons once technical problems in strengthening the original cast iron body had been overcome.