chap,

Consider a 50-70 shooter who shoots a 425 grain unjacketed bullet. His quarry is bison. At 180 yards the bullet enters the shoulder crush the scapula piercing both lungs and exits the far side. The bison falls where it stands as millions of other did until they were practically extinct. Ask yourself what the practical difference between a 444 PB and a 425 lyman projectile is and whether there will be any penetration on deer when it is propelled by the same 70 grain charge of the 50-70.

It should be obvious then, that saying a PB won't penetrate or don't penetrate requires context and is only a half-truth.