I watched the Jurassic World movie on Monday and noted that the Chris Pratt character actually had a good choice of rifle for the situation he was in! A lever action Marlin 1895SBL chambered in .45-70 (hopefully not one of the badly made Remlins), a reliable gun in a calibre known to be effective for bigger game. Even better he had plenty of ammunition for it (on the sling and his jacket) and unlike many a film kept it to hand nearly all the time rather than inexplicably leaving it somewhere. The SPAS 12 looked cool in Jurassic Park but it is a pretty poor choice.
This is only the second time I have seen a good gun choice in a Jurassic park series with the Pete Postlethwaite character being the other with his .600 nitro express double rifle albeit he loses marks for leaving it unattended with a known animal rights activist, not checking it at anytime afterwards and for no apparent reason having no spare ammunition on his person (A big Game Warden and Dangerous Game hunter from Africa and he only has two bullets on him?!
). In the real world when he shot at the Tyrannosaur and found two empty chambers he would of just loaded it again...but I digress. 
Old now sadly deceased Pete with the Nitro Express:
Also some honorable mentions for lost world with the M134 gatling gun and AT4 anti tank missiles...
