JBMauser,
Colonel Harrison wrote,in the AmericanRifleman,that the grooved bullet was superior to the plain sided bullet. (paper patched)
In My experience,the only accuracy that I get in My well worn Springfield Krag,is with grooved bullets that are sized down. Several dozen combinations of two different molds and six different core lengths with smoothe bullets have been far less successful.
On the other hand,I've never tried grooved bullets in My 30/30 because I am completely satisfied wiith the smoothies.
I think that it is possible that the only advantage of the smoothe sided bullet is that it is so much easier to cast perfect ones.
I would welcome any comment,backed by personel experience,that disagrees with this statement. The reason is that I still don't know a heck of a lot about paper bullets.
Frank