How many pressure figures are given for the .380 acp cartridge?
CREATE TABLE "38_comparisons" (
  "cartridge" text,
  "bullet_weight" text,
  "muzzle_velocity" text,
  "muzzle_energy" text,
  "max_pressure" text
);
SELECT COUNT("max_pressure") FROM "38_comparisons" WHERE "cartridge"='.380 ACP';