No need to do it so long as you get 100% chamber and 100% feed out of the magazines into the chamber.
I have a question for those that do not flare the case neck.
When the spent case is resized, the inside diameter of the case is reduced smaller than the diameter of the bullet. Unless the bullet base has rounded/tapered bottom, how are you seating the bullet without crushing the case?
For me, seating FMJ bullets with flat base requires case neck flare. Even for plated bullets with "rounded" base, seating them without case neck flare will result in slight "bulging" of case which results from minute crushing of case that shortens the case and makes the outer diameter larger.
This is less obvious in factory barrels with generous chambers and the bulged cases will drop in freely with a "plonk" but in my tight chambered Lone Wolf barrels, they won't chamber fully, indicating they may not reliably feed/chamber in all pistols/barrels.
I reload for multiple pistols of my family/friends/neighbors and must ensure all of the finished rounds perform reliably in all pistols/barrels. IMO, applying case neck flare just so that the bullet base can be placed inside the flared case neck is a good reloading practice to ensure you are not crushing the case.
rcmodel said:
Think of taper-crimp as Not a crimp.
It should have nothing to do with crimping the bullet in place.
Case neck tension is what holds the bullet in place.
Think of it as straightening the bell and returning the case to perfect straightness on the sides.
+1. For me, adding .020" to the diameter of the bullet will either apply flat taper crimp or slight negative taper crimp as depending on headstamp, some case walls are thicker than .010".