What is the max pressure for the 468ft•lbf (634 j) muzzle energy?
CREATE TABLE "38_comparisons" (
  "cartridge" text,
  "bullet_weight" text,
  "muzzle_velocity" text,
  "muzzle_energy" text,
  "max_pressure" text
);
SELECT "max_pressure" FROM "38_comparisons" WHERE "muzzle_energy"='468ft•lbf (634 j)';