In the next few months I will be buying my first double, probably a searcy PH model. I want something in a nitro caliber, and was considering the various chamberings between .470 to .577. what are the various advantages between the cartridges? I am considering the .470 due to the ammo being slightly more available, but I am a serious reloader so other calibers wouldn't be a problem. For the same price would the .500 nitro be a better choice? If I could get a .577 for nearly the same price would it be even better? I've always thought for the same price bigger is better, but in this case it may not. I plan on hunting Africa in the next few years, and this would be used on buffs and hopefully one day I'd like to take an elephant with it. As far as penetration and knockdown power goes between the three, if anyone has any knowledge or real world experience to share, it would be appreciated. Links to sites with info too would be great.