I use the "Dead Center" bullets. Currently the 340 tipped, before that the 360 non-tipped, and before that the Buffalo Bullets SSB in 375. They have always flew great out to 200 yards (farthest I've shot them) and have done a great job killing elk over the last 14 odd years. Think I've killed 11 with them now.
I shoot the 50 cal. version, but the 54 is the same with a thicker sabot(I've shot them as well).
They look like this when you find them under the hide on the far side.

