fˈɜːðɚ mˌɑːdɪfɪkˈeɪʃənz ʌv bˈɜːn ɹˈeɪt wɜːɹ ɐtʃˈiːvd baɪ ʃˈeɪpɪŋ ðɪ ˌɪndᵻvˈɪdʒuːəl pˈaʊdɚ ɡɹˈeɪnz, ˈɔfən ˌɪntʊ pɹɪsmˈæɾɪk ʃˈeɪps sˈʌtʃ ɐz sˈɪŋɡəlpˈɜːfɚɹˌeɪɾᵻd hˈɛksɐɡənəl ɔːɹ ˈɑːktɐɡənəl pɹˈɪzəmz.
Further modifications of burn rate were achieved by shaping the individual powder grains, often into prismatic shapes such as single-perforated hexagonal or octagonal prisms.