Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_50168 ( "Cartridge" text, "Bullet weight" text, "Muzzle velocity" text, "Muzzle energy" text, "Max pressure" text )

### Question ###
What is the max pressure for the 468ft lbf (634 j) muzzle energy?

### Accurate SQL ###

SELECT "Max pressure" FROM table_50168 WHERE "Muzzle energy" = '468ft•lbf (634 j)'