ɪmpɹˈuːvmənts ɪn bɹˈiːtʃ mˈɛkənˌɪzəmz ɪnðə pˈiəɹɪəd wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti tə wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd ˈeɪɾi, təɡˌɛðɚ wɪððɪ ˌɪntɹədˈʌkʃən ʌv lˈɑːɹdʒ ɡɹˈeɪn pˈaʊdɚ, kˈɔːzd ðə nˈeɪvi tə ɹˌiːɐdˈɑːpt ðɪ ˌɑːɹbˌiːˈɛl æz ðə nˈuː pˈaʊdɚ ɹᵻkwˈaɪɚd lˈɔŋɡɚ bˈæɹəlz wˌɪtʃ kʊd nˌɑːt biː wɪθdɹˈɔːn ˌɪntʊ ðə tˈɜːɹɪt fɔːɹ lˈoʊdɪŋ.
Improvements in breech mechanisms in the period 1860 to 1880, together with the introduction of large grain powder, caused the Navy to re-adopt the RBL as the new powder required longer barrels which could not be withdrawn into the turret for loading.