Skyline-I have taken and seen taken and been around a fair handfull of elk taken in the 500-650 (using Sierra's, NBT's, NPT's and TSX's, and Hornday's in particular) range and I've never found the big 7's or the 270 to be lacking for this work.
People will run out of ability way b4 the round will make no doubt about it.
In terms of good bullets there is about no end of them anymore for the big 7's and many other cals.
Good luck on your elk hunting.
Dober
