Have you thought about the 50 beowulf? It's got the 'grin factor' you are after, but not so obscure that it's hard to find. shooting factory ammo isn't quite as expensive as factory socom, more readily available comparatively speaking and would get you up and running until you learn to reload. Johhny is right, time to pick that skill up man!
Then again, that .458 is sure to get attention at the range, if that's what you're after.
Then again, that .458 is sure to get attention at the range, if that's what you're after.