They originally did that to keep the bullet from pushing down into the case. The cannelure was placed just under the bullet.
I was thinking along those lines. Did they not crimp the bullet then, and do they not crimp the bullet now? Seems as if they are clinging to the past. I always use Starline for my hunting loads, but use others for practice and such. Won't use the Win for anything but mouse fart loads if even that.
