Looking into my crystal ball, I see many will argue that diameter matters below .355", but ceases to matter above .355". That's with the unexpanded projectile of course. Because we all know it needs to expand to 1.5X (or greater) of the original diameter, which would be.... 0.5325". And Federal only claims the expansion of their 100gr 30SC is 0.530", which is just too small because [insert pseudo science here]. That 0.0025" is absolutely critical to effectively stop an attacker. Solved it! This cartridge obviously cannot work.