More bullets

Found about 8-10 of these the other day at first i thought they were modern (still might be) nut the only thing that made me keep them was after looking more closely was the hexagon shape on the base of the bullets. I know Whitsworth bullets are hexagon shaped but i not positive if these are Whitsworth fired. I have looked and researched and really unable to get accurate measurement. Any suggestions , ideas of what type. Thanks