Depends on what you are trying to do.
If you are trying to maximize powder space and bullet weight, then a long bore riding section can be a useful way to pack weight onto the nose.
On the other hand, if powder space is not an issue, or if you have excess powder space, then a short truncated cone will, for a given weight, force the bottom half of the bullet to be longer, which can be a good thing up to a point because it eats up excessive powder space, increases bearing length, and increases lube capacity.
If your goal is to ensure reliable chambering, then either a truncated cone nose or a bore riding truncated cone nose can serve that purpose.
A 0.001" step is pretty meaningless since there will be 0.002" tolerance, plus it is common for the nose to be unintentionally bumped up by the lubrisizer. I'd suggest making a wheelgun bore rider about 0.002" larger than bore diameter, which might be 0.444" - 0.446" for the 460 S&W.
Is the 460's chamber so short that there is only 0.05" between the case mouth and the 0.452" throat? The reason I ask is that a 0.050" long front band will be troublesome to fill out with the humble wheelweight alloy that most of us use for big bores..
The Star lubrisizer supposedly works better when the bullet is a snug fit in the sizing die, so Star owners often like their bullets to drop about 0.002" over the sizing diameter.
RCBS/Lyman lubrisizers are relatively puny and the die quality is often poor, so these machines are not happy doing heavy duty sizing. If you plan to size in one of these, I would suggest spec'ing the bullet to 0.452"+.
"Bucket droppers" -- people who heat treat by letting the hot bullets fall from the mold into a 5 gallon pail of water -- like the bullet to drop out of the mold at the size-to diameter because the bucket dropped bullets don't like to be sized. Sometimes the perfect as-cast diameter is wishful thinking, though.
I normally let my bullets air-cool, then size in a push-thru die, then oven-treat, and then lube in a lubrisizer. Since the soft air-cooled bullets are easy to size in a good push-thru die, I prefer the as-cast diameter to be plenty big. The oversize bullets allow experimenting with different sized diameters, and it insures that the bullets will be "big enough" despite normal casting tolerances. If this were my bullet, I would spec it 0.453"+.