Im looking for a good flat shooting deer round. I was leaning towards the 257. Is a 120 grain bullet enough out to 500 to 600 yards? or farther? Im interested in input. I have been shooting a 280 for 4 years and I like it but I want a gun for deer and a gun for elk. I like the 6.5's a lot also and am having a hard time deciding what to build.