I've never used anything above 405. I'm just curious though, when is T-Rex season in LA??? 
Ya never know what will climb outta the La Brea Tar Pits. Besides that scenario, I can see a Mastodon getting loose after they use recovered DNA and an African Elephant to clone an "old shaggy".
Now, flash to reality, and I'll relate a story, and it ain't no BS.
Several years back, there was a farmer north of Idaho Falls, closer to Roberts, really, that had a penchant for "exotic" animals, and had been keeping a zoo-born rhino at his place. Apparently, it had little respect for fences, and had a penchant for getting loose. When it wandered through a neighbor's yard (and in that area, the neighbor was close to a half mile away) the neighbor called the Sheriff, and after the laughter on the 911 line died down, and they realized they were serious, the Sheriff's office dispatched two deputies to deal with the situation. The officers were about to try to make the offending rhino head off into the great Savannah in the Sky via lead poisoning with their trusty 9mm handguns, when the rhino's owner arrived on the scene accompanied by a small Hispanic boy who had a willow stick in his hand. The boy walked right up to the rhino, tapped the critter on the butt, and then on either side of the animal to indicate which direction the boy needed the rhino to go. Walked it right back to it's pen without incident, and the owner sold it off shortly thereafter. So there you have it, a rampaging Rhinoceros in South Eastern Idaho..........who woulda thunkit? And people laugh at me for using my .500 S&W with hard cast 500 grainers to shoot jack rabbits in that area! I ain't takin' no chances, no Sir!
