RE: Which bullet for .243Win?
The rifle is a Remington 700SPS Stainless with a 24" barrel. The Sierra 85gr HPBT are seated 0.015" of the rifling for a COL of 2.651". Every rifle is slightly different, so the COL may vary. I haven't measured the velocity yet, but they are snappier than the Remington 100gr PSP CoreLokt factory loads. I'm estimating around the 3100ft/s mark.
Hope that helps.