252+ Atk Life Orb Sheer Force Steelix Iron Head vs. 252 HP / 0 Def Mew: 183-216 (45.2 - 53.4%) -- 34% chance to 2HKO
VS
252+ Atk Sand Force Steelix Iron Head vs. 252 HP / 0 Def Mew in Sand: 181-214 (44.8 - 52.9%) -- 85.9% chance to 2HKO after sandstorm damage
Sand Force boosts all steel, ground, and rock moves. Earthquake, its best stab, isn't boosted by sheer force. But it is by sand force. And so are heavy slam and gyro ball.
So you don't have to rely on weak old iron head.
252+ Atk Sand Force Steelix Earthquake vs. 252 HP / 0 Def Mew in Sand: 228-268 (56.4 - 66.3%) -- guaranteed 2HKO after sandstorm damage
252+ Atk Sand Force Steelix Heavy Slam (120 BP) vs. 252 HP / 0 Def Mew in Sand: 271-321 (67 - 79.4%) -- guaranteed 2HKO after sandstorm damage
252+ Atk Sand Force Steelix Gyro Ball (150 BP) vs. 252 HP / 0 Def Mew in Sand: 339-400 (83.9 - 99%) -- guaranteed 2HKO after sandstorm damage
A rock move gives you some solid edgequake, with the last slot up to you. Curse once, maybe protect or even fire/ice/thunderfang.
I just can't wait to try a TR sand team
