probably dont need nothing like a 50 caliber.they were smaller than the jurassic park movies.im a ninja so i could probably sneak up on it with a sword and kill it.that dont work get the 357 out.oh right.back to reality.drinking shitty ole natural ice like i do everyday.worst and cheapest liqour i ever had was charcoal filtered.if that made it better id hate to drink that shit before it was filtered.it was bad enough as it wastime travel to hunt a species you knew was going to be extinct in the future would be guilt-free, unlike possibly killing a tiger, elephant, or polar bear (none of which i would consider), which may or may not be around in another hundred years or so. i wonder what caliber rifle you would need to penetrate a T-Rex skull before it got to you? that would make an elephant charge look "ho-hum"...