the frontal area of .30 carbine, and LOTS blunter. so it WILL transmit FAR more % of its 800 ft lbs than the .30C ball rd does with ITS 800 ft lbs (say, 25m hit with 30 C, COMMON in military combat).
It's STILL a .45 caliber hole in you, and it's still a LOT of energy, and it's STILL the rifle sp temporay cavity effect of a 2300 fps hit.