I have never pulled a HW calf that had a normal presentation. Had my first Naughty Pine this year and he wieghed 150 pounds, the cow has some bw behind her, but my goodness, thats crazy. Had my fist Hired Man and he tipped in at 135. My first 'assist' on a HW today, leg back. After I got the leg up she about put him on me. As much HW that is used on EVERYTHING he is going to get some monsters. Use that many of some of the other bulls you'll get some bigguns sneak up on you every once in a while. I would not reccomend NP, HM or MM on a second calver. Just by my observations. By the way the 150 pounder was getting licked off by his mother an hour after water bag, born unassisted, that girl has some room!!