[Long Cut]

I always wondered WHAT you'd use if you were hunting, or had to shoot, a dinosaur. Let's see...a T-Rex weighed about 8-12 tons and stood a good 20 feet tall. Thick hide could be assumed, as could a well-protected nervous system.

I don't think I'd want to take one on willingly with less than a .460, and even THEN I'd want a larger-than-stock magazine.

For bigger game, like Brontos or Brachiosaurs, in the 30-70 ton range, a .50 would probably be best. Opinions? I KNOW it's pure speculation, but hell, it's fun.

[harpseal]

I personally would want the 20mm Barret at minimum for a T-Rex that thing has way too big a set of teeth to trust anything less.

[Squantos]

Ronnie Barretts new 25x59B Payload rifle is the tewl you seek LC !

Same ballistics as a .50 caliber with a HEDP round at the end of said trajectory.

The shorter of the two is the better and badder beast.......(My old EOD toy takes a back seat to this new payload rifle :o) Stay Safe !

[SLB]

I would hazard to guess that any of these http://www.fas.org/man/dod-101/sys/land/120.htm would dispatch just about anything you wanted to hunt that came on two or four legs.

[Crowcreek]

"Opinions? I KNOW it's pure speculation, but hell, it's fun."

Heck, it's not speculation -- You'll need something that will reliably break any bones involved AND penetrate to the far side. Ideally, it should still have enough energy to leave an exit hole, but many slugs stop under the far-side hide after smashing a shoulder ball-joint.

I can't think of any rifle other than the .50 BMG that would perform on a reptile that size.