I personally like to keep the ogive radius at one caliber. A 1/2 caliber is a full round nose. I used to swage bullets mostly because I could not get the quality bullet moulds that are available now days as well as HP bullets when I did a lot of CMP matches, I swaged them to get what I wanted to use.
The photo below are a few I used to swage and I made the jackets from copper tubing.
The top row are some .458" and the finished bullet has the 1E (one caliber ogive) and I also have other dies for the .40 and .44
Here is a link to the Corbin swage company and it has a lot of good information for bullets designs of all types. For what we mostly use look at the Round nosed and Ellipticals.
http://corbins.com/bullets.htm#elliptical