hmmm thats wild......everything i thought i knew about muzzleloaders went out the window somewhere if this is true....the end of the civil war? im not sure but i think the metalic cartridge came during the war....im not posative though....i know blackpowder cartridges are able to do it...like the 45-70s and all them old "buffalo" guns.....but dont know about a muzzleloader....i really want to know....the progressive twist doesnt sound like it would do much for velocity and power....just stabilizing the bullet.....so i dont know how its possible 700 yds with a muzzleloader is a poke and a half....someone should know something on here