Lonestar,
Nosler use to make its Nosler Partition bullet in 105 grains. So, at least Nosler thought that the extra 5 grains made a difference.
Sure, it was probably not too much of a difference, but 5% extra weight is 5% extra weight. Maybe the NPs needed the extra weight to perform like they were suppose to?
And, by the way, particularly in the last 10 years, entire new rifle cartridges have been invented and widely sold, on the premises that they hit 5% harder than an existing cartridge. This is also the basis of all of the Light Magnum and HE rounds.
Make no mistake. I love the Core-Lokts. But with a deer in the 225 pound area, I would just prefer that extra weight in the .243 bullet. Of course, if you make a broadside lung shot, I agree, there wouldn't be that much of a difference.
Best,
Mannyrock