I need to fireform 100 .32-40 cases.  The current plan is to use a 200gr Spitzer and 15 gr 4759.

Which would be more effective:

1: Firing loaded rounds, the bullet taper crimped with the sizing die.

2: Breech seated bullet, charged, primed case with as much of a bell to the mouth that I can still insert the case with a dowel to seat it in the chamber.

3: A variation on one of the above or a method I haven't thought of (including using a different powder).

The rifle is a Falling Block Works Model K.

Thanks

I have fired formed many 32-40 as well as other cases by the following method.
Load primer as normal, fill case with about 7-10 grs of fast shotgun powder (I use 700x) and fill the remainer of the case with cream of wheat leaving enough room for a thin floral foam wad.
shoot them in a safe direction.
You should now have fire formed cases.

A. J. Palik