I had three heifers bred to him, two calved easily BUT they were big heifers, 1/4 simmi, 3/4 Angus. The third died as she started to calve. Literally dropped dead, no struggle or anything. When we moved her she had bright red blood come out of her nose and mouth. Our vet said she probably ruptured her pulmonary artery. Of course she was our pet, my 9 year old daughter who owned her was totally beside herself.
Back to the topic, the calves were both 80 pounds (bulls) and I don't think I would use him again on heifers. I am going to stick with negative birthweight EPD's. If I recall he is over 2.