There is really nio way to figure the expansion of a jacketed bullet because it is all dependent on where it hits. If it hits a big bone it could expand to the point where penetration would be lost. It could miss all the bones and expand very little. If all goes well they will expand as intended however again it would depend on what the make up of the bullet is. There are to many to know. The wide nose hard cast bullet is already as big as most expanded bullet are after expansion. At higher velocity some cast bullets will expand too but that would steer them off track and limit their penetration. This said most big cast bullet give plenty of penetration. Big cast bullets have been killing game animals very well for 150 years or more. Cast bullets are really a whole other world of their own. The completely flat nose and square edges also add tho their performance and add greatly to the permanent would channel. (Channel that doesn't seal up after the bullet passes through.