CREATE TABLE table_50169 ("Cartridge" TEXT, "Bullet weight" TEXT, "Muzzle velocity" TEXT, "Muzzle energy" TEXT, "Max pressure" TEXT)

What is the muzzle velocity for the muzzle energy 351ft lbf (476 j)?
SELECT "Muzzle velocity" FROM table_50169 WHERE "Muzzle energy" = '351ft•lbf (476 j)'
SELECT "Muzzle velocity" FROM "table_50169" WHERE "Muzzle energy" = '351ft•lbf (476 j)'