CREATE TABLE table_50168 ("Cartridge" TEXT, "Bullet weight" TEXT, "Muzzle velocity" TEXT, "Muzzle energy" TEXT, "Max pressure" TEXT)

What is the max pressure for the 468ft lbf (634 j) muzzle energy?
SELECT "Max pressure" FROM table_50168 WHERE "Muzzle energy" = '468ft•lbf (634 j)'
SELECT "Max pressure" FROM "table_50168" WHERE "Muzzle energy" = '468ft•lbf (634 j)'