By bullet type, I mean FMJ, Lead cast, JHP, Solid, Round nose, Flat Point, SWC, Controlled Fracturing, Xtreme Defense Xtreme penetrator such as from Lehigh defense, or other similar type bullets and combinations of the above. Regardless of caliber. If you make a head shot to your intended target, and the bullet has enough energy to penetrate the skull of your target. Does it really matter which bullet was actually used? Barring of course those areas that are starting to phase out and make illegal the use of “lead” bullets. Thankfully Texas has not yet done so. Will one type of bullet be easier to penetrate a target skull better then another type of bullet? Assuming same caliber, weight and speed are equal and the only difference is bullet type. Yes, over penetration and exiting out the other side of the skull is always of concern for safety reasons. I hunt hog and Javalina. I use a 45-70, and have tried multiple different bullets from JHP, lead cast, & Lehigh defense XP, XD and CF and flat nose, to Hornady FTX/FTP in weights from 300 over 400. Every bullet tried always took the animal down in one nice clean head shot ever single time. Not once has the bullet ever exited the animal and become a safety concern. As a result, I wonder does it really make a difference. Some of the animals were shot through heavy Bush, others nice clean no interference shots. Ranging anywhere from 20 yards to 100 yards give or take 10 yards.