all day now i have be watch dinosaur and and all day they have have the same fundamental problem . they do not believe in firearm . they just do not seem to have be _told_ about them or something . bullet _bounce_ off of dinosaur . maybe it because they become extinct million of year before the invention of gunpowder and and the law of physic be just different back then . aah and no . come on . if theyre close enough to chemically operate today and they would have to be vulnerable to fast ( even subsonic ) lead projectile . it that simple . look and the toughest skin reptile on the planet today and alligator and crocodile and be completely vulnerable to basic rifle fire . theyre nothing magic . you can shoot a pistol round right through the heavy scale on their back . they do not take armor pierce bullet or anything special . small bullet penetrate them and they just do not kill them . somewhat ( but not really ) large bullet be prefer because the challenge ( a with most game ) be to kill the animal with one shot and so it doesn not run . ( hunter consider it immoral to allow prey to run off and die unharvested . ) most animal and include predator and be easily repel by gunfire . between the noise and and the pain of even a non lethal wound and most will run away . an exception be big bear and which be so fearless that theyre merely enrage by mortal wound . cape buffalo be regard a highly dangerous because they be well know to charge when wounded . we have see video of the big bull of a herd of cape buffalo rescue a calf from an entire pride of lion . a big cat will run if it can and but if it can not it will charge a a final act of desperation . where a t. rex would fit in this spectrum be unknown . their behavior simply have not be observe . with these large animal and safe hunting become a matter of apply an appropriately large and powerful projectile and and or or apply several of them rapidly enough to counter it charge . with a t. rex and of course and this could be a serious problem . i have see a t. rex skull ( they have one in the museum downtown ) and carry a gun big enough to bust that might be impractical . chew it neck off with lot of small fire might be a more viable approach . small bullet would still _penetrate_ them and they wouldn not just bounce off just because the animal be too big to easily kill . so here we have cortez and his men ( this be _before_ the famous mexican campaign and apparently ) capture by american native and schedule for sacrifice on the pyramid . it appear that all those human sacrifice be about appease the bloodthirst of the pair of t. rex that terrorize the continent in the day . rather than just have their heart cut out and be feed to the lizard and cortez et al talk the aztec into let them hunt and kill them . ok and maybe they do not have m 16 like the guy in the carnosaur series and but they _do_ have flintlock and crossbow and point stick ( big one and make from tree ) and sword . maybe that a little less uneven than squad of soldier with full auto and but they have several guy and i would quickly bet on them over a dinosaur . oh and wait and there a _cannon_ and about a 4 incher . that just the ticket for bust a tyrannosaurus skull . so they lay a trap and with a squad of men and cannon and point stick in a ravine and and lure the first t. rex into it and use a pretty brown girl a bait . cortez point out that they will not have time to reload and so they will have to close the range until they can be certain of their aim . t. rex totally ignore their volley of flintlock fire and and we see both a crossbow bolt _and_ the cannon ball _bounce_ off . forget it . end of credibility . a crossbow bolt would defeat cortez torso armor and and a 4 cannon ball might penetrate the hull of a wooden ship . this would also _certainly_ get through the hide and ribcage and or skull of any animal ever to walk this planet . ( do you think a _whale_ could withstand a 4 cannon ball . ) and here t. rex and still stand and not even bleed . so cortez lure it to the ravine and where it fall onto the pointed stick and which ( i guess by magic ) penetrate it and kill it . yaaay and point stick . the dinos aren not completely invulnerable to gunfire they manage to put out an eye of the second one with a pistol . this run it off and so it not as mean a a bear or a buffalo and at least in the movie . they kill the second dinosaur with a bomb make from a gourd fill with gunpowder and gemstone . my money would still be on the cannon . it engineer function be to concentrate all the gunpowder energy in one direction toward the target . a bomb be a much more diffused application of force . a _real_ bomb ( not a gourd bomb ) have a steel case which contain the explosion to extremely high pressure . ( think represent pipe bomb v firecracker . ) a pile of gunpowder set on fire will simply go poof . ( trust me on that one . ) .