Of all the round nose 200gr bullets the rem corelokt is the toughest and yet the easiest to expand at low velocities. All the 200RN's were made for the 35rem and its oridgenal 2110fps to 2140fps for some longer barrels.

I shoot them at 2200fps from a 35rem and they will take more velocity the that. How everI shoot the 200gr PSP CoreLokt and the 200gr Hornady Spire Point from a 358win and they work great on deer, but would not use them on anything larger than deer. For black bear, elk, and moose I use the 225gr partiton. It expands fast and still maintains 60-70% of its weight to punch very deep if not 100% and out the other side.