Chip - Don't know this for a certainty but suspect that the Hornady Interlock design is very close. Hornadys are what I use the most of these days for practice, ever since Nosler quit making the Solid Base bullets.
In most of my guns I can make up loads with Hornadys then switch to Partitions without any need to change the scope settings.
If for some reason I all of a sudden didn't have Partitions available Hornadys are probably what would be used in their place.
Jim
