The Calibers: Pistol gives a short history; known alias(es); pertinent historical data; background loading data, including best powders; best bullet weights, best load developed; velocity; muzzle energy; and resultant target for the best load developed. In the last section, the comments, Robert Sumner tells you about making cases from other calibers, whether the caliber is a keeper. Robert notes he has an adequate coverage for the more common and some not-so-common calibers.