Please do not think I would not feel totally comfortable using the 180 gr version on elk because that is not true and I feel you have a totally adaquate elk bullet.
As I stated, at 500 yards I would feel fine with a 180 gr Ballistic Tip for a chest shot and the 180 gr ACcubond is a far better heavy game bullet then this one.
As with you, if I tested a load that shot as well as yours, I would probably save the time and money and stick with the 180 gr load as well.
The Grass is always greener mentality is not always a good way to look at rifles.
I much prefer the "if it ain't broke don't fix it" theory.
I was not questioning you at all on your load developement. If I were to develope loads for the 300 WSM
I would start with the 180 gr version first as well, better ballance of weight for this case volume.
With the 300 RUM, I would start with the 200 gr version, just because I feel this is a better balance for the big RUM case, this was my only criteria in my posting I would use the 200 gr version first.
Good Shooting, let us know how the load works on game this season!