Skeet
Double Radius Bullets, (ie, those that start out with one ogive number and end up with another as it approaches the shank), caught on about 8-10 years ago.
Here is sort of how it all came about. A very popular Benchrest Gunsmith, and Bullet Maker, was fooling around in a attempt to re-burn a die. After it was done, the results, mainly by pure accident, resulted in a bullet that had a double radius, or pretty close. The die ended up in the hands of another shooter, who just happen to furnish the bullets for one of the best shooters on the Planet. They became the talk of the town, and so other bullet makers started having dies made that produced the same type of bullet. The Ultra is this type of bullet.
For years, Benchrest was ruled by relative straight shank bullets with a conservative ogive. The originol Berger, the Fowler, Watson and others are good examples. Bullet Makers, such as Cecil Tucker, had dies that made high ogive number bullets, but they were not the same as the current crop.
Of the double radius bullets now being used, The Ultra, HeadHunter, Hottenstien, and Bruno 00 are among some of the more popular.
I doubt there is really any "advantage" in using this type of bullet over any other. The fact is, great bullets are more of a product of the Die and individule components than anything else. Some barrels tend to like them, but then, great barrels tend to like much of anything you feed them...........jackie