I practice most of the year with field tips. That is so my form and anchor points become second nature. I want these to be correct and automatic. I don't want to have to think about them at the moment of truth. I want muscle memory to set my form and anchors.
I shoot 100gr Muzzys 3 blade and they have the same point of impact as my field tips. I also have 3 different targets and shoot BHs at times throughout the year. I don't use the Muzzy "practice" blades I use last years hunting blades so I know things will fly true if I do my part.