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_name_6 (shell__lb_ VARCHAR, time_to_ft__m__at_40°__seconds_ VARCHAR)

### Question ###
What is the weight of the shell that reached its maximum height at 40° in 12.6 seconds?

### Accurate SQL ###

SELECT shell__lb_ FROM table_name_6 WHERE time_to_ft__m__at_40°__seconds_ = 12.6