I do not chamfer my .45 ACP brass. In the past 5 years I have reloaded over 20 thousand of them. I tend to loose the brass long before it ever splits. I always leave the range with more brass than I brought with me as well.
If what you are doing is working for you I would stay with that. I found what works well for me, and have stuck with it. I have two friends that I have mentored in thier first few reloads. They now do what what works for them, that is within safe practices.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.