CREATE TABLE table_name_6 (shell__lb_ VARCHAR(255), time_to_ft__m__at_40°__seconds_ VARCHAR(255))
What is the weight of the shell that reached its maximum height at 40° in 12.6 seconds?
    
SQL: SELECT shell__lb_ FROM table_name_6 WHERE time_to_ft__m__at_40°__seconds_ = 12.6