["< sod >'''parker otto ackley'''( may 25, 1903, [ [ granville, new york ] ] – august 23, 1989 ) < ref > [ http : / / www. deseretnews. com / article / 61213 / deseret news | services planned monday for gunsmith parker ackley ]. < / ref > was a prolific american [ [ gunsmith ] ], author, columnist, and [ [ wildcat cartridge ] ] developer. the'''ackley improved'''family of wildcat cartridges are designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity. ackley improved not only standard cartridges, but also other popular wildcats, and was the first to create a. 17 caliber ( 4. 5 & nbsp ; mm ) centerfire cartridge. < ref > { { cite journal | url = http : / / www. gunsandammomag. com / classics / bomb _ 1007 / | title =. 17 - caliber ultra bomb! | author = dave moreton | date = may 1968 | journal = guns & ammo | format = & ndash ; < sup > [ http : / / scholar. google. co. uk / scholar? hl = en & lr = & q = intitle % 3a. 17 - caliber + ultra + bomb % 21 & as _ publication = guns + % 26 + ammo & as _ ylo = 1968 & as _ yhi = 1968 & btng = search scholar search ] < / sup > | deadurl = yes | archiveurl = https : / / web. archive. org / web / 20071228023724 / http : / / www. gunsandammomag. com / classics / bomb _ 1007 / | archivedate = by december 28, 2007 } } < / ref > < eod > < sod >'''parker otto ackley'''( may 25, 1903, [ [ granville, new york ] ] – august 23, 1989 ) < ref > [ http : / / www. deseretnews. com / article / 61213 / deseret news | services planned monday for gunsmith parker ackley ]. < / ref > was an american [ [ gunsmith ] ], author, columnist, and [ [ wildcat cartridge ] ] developer. the'''ackley improved'''family of wildcat cartridges are designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity. ackley improved not only standard cartridges, but also other popular wildcats, and was the first to create a. 17 caliber ( 4. 5 & nbsp ; mm ) centerfire cartridge. < ref > { { cite journal | url = http : / / www. gunsandammomag. com / classics / bomb _ 1007 / | title =. 17 - caliber ultra bomb! | author = dave moreton | date = may 1968 | journal = guns & ammo | format = & ndash ; < sup > [ http : / / scholar. google. co. uk / scholar? hl = en & lr = & q = intitle % 3a. 17 - caliber + ultra + bomb % 21 & as _ publication = guns + % 26 + ammo & as _ ylo = 1968 & as _ yhi = 1968 & btng = search scholar search ] < / sup > | deadurl = yes | archiveurl = https : / / web. archive. org / web / 20071228023724 / http : / / www. gunsandammomag. com / classics / bomb _ 1007 / | archivedate = december 28, 2007 } } < / ref > < eod >"]