The most I have needed to pull, in one batch, was about 250 rounds of HXP 30-06 and used an impact tool. The key is doing a many as I felt like doing at a time, whether it was 10 rounds or 50. I once had 20 rounds of 357 Magnum I wasn't comfortable with the load. A heavy crimp, good neck tension and they took several hard whacks to get the bullets out, enough that I eventually split the handle of my FA pullet (I made a longer wood handle and wrapped the top 3" with copper wire, now I can smack an anvil as hard as I can!). I still use an impact bullet puller as my preferred method and with a foam earplug there isn't a lot of damage to the bullets...