safariman,
Here are pictures of the 450 grain NF FPS and the 450 grain heavy jacket FP FMJ Kodiak bullets used in the .45-90 loads.It is easy to see which bullet leaves the most space in the case for powder.

[Linked Image]

The batch of Kodiaks that went to Africa were custom loaded by Grizzly cartridge with their proprietary powder and techniques, so load details are unavailable.

I will check my load notes on the NF loads and send a PM, but it will be a few days before I get back to where this information is located.

CRS, NRA Benefactor Life Member, Whittington Center, TSRA, DWWC, DRSS
Android Reloading Ballistics App at http://www.xplat.net/