I don't use a taper crimp on revolver ammo. I use a light roll crimp on target or mid-level loads, and I use the beloved Lee Factory Crimp on the heavy loads.

I do not see a need to ever use a heavy crimp, but "light", "medium", and "heavy" are subjective when it comes to crimping.

I believe case neck tension should be adjusted for a firm grip on the bullet, so a heavy crimp is not necessary.

I never use 296/110 powder, but 2400 for my magnum revolver loads because it is easy to ignite and does not require a lot of resistance (that some believe comes from a heavy crimp) to get it lit.