RE: .504- 400gr. bullshops
The 460 & 500 grain shoot excellent out of the Ultra Mag. For deer just 70 grains of Triple Se7en 3f and the conical and you're in business. I have not hunted anything bigger then deer, and since I also am new to this rifle, have not had the opportunity to shoot game with it. From some penetration tests with it, there will be no problem what so ever.
I personally do not feel a 500 grain is too large for deer. If the accuracy is there and you can place your shot, that conical will hit, expand, and the deer will be parked right there. Which is a very important feature where I hunt.
Next time out I am going to try some .504 Maxiball I have. They are 370 grain and I want to really push them just to see what happens..