You would actualy have to add metal to the mold to get the lube groove deeper.
What major says ----- think about it fer a minute
Yes, folks, the large rifle mold 457193/420 , looks like this
any cutting would enlarge the driving bands to a wider band, decreasing the amount of lube...
or a greater diameter thus making the bullet to large in diameter.
One Cannot cut the lube grooves deeper. I tried once .... turned a .45 pistol mold into a .50
to increase the amount of lube, one would start with a smaller mold, say a .452, and cut the driving bands a larger diameter,
such as .457.
i was going to try to post an image, but its waaaaay too hard today....
yhs
prof marvel