Rattlesnakes of this species considered medium-sized weighed 1.8 to 2.7 kg ( 4.0 to 6.0 lb ) , while very large specimens can reportedly weigh up to 6.7 kg ( 15 lb ) .
These rattlesnakes usually weigh about 1.8 to 2.7 kg ( 4.0 to 6.0 Ib ) , but some can weigh 6.7 kg ( 15 Ib ) .