"Boat-tail" is fine. A quick Google search will give you a better explanation than I can of the meaning of "boat-tail".
However, the ammunition you link to is not sub-sonic. Muzzle velocity is over 2700 feet per second. (Unless of course I'm looking at the wrong ammo---which is a real possibility.)
https://www.hornady.com/ammunition/rifle/223-rem-75-gr-bthp-match#!/#features
However, the ammunition you link to is not sub-sonic. Muzzle velocity is over 2700 feet per second. (Unless of course I'm looking at the wrong ammo---which is a real possibility.)
https://www.hornady.com/ammunition/rifle/223-rem-75-gr-bthp-match#!/#features