I saw 7 A-frames absolutely pancake in a buffalo. These were fired from a 9.3 Sisk, 286 grainers in the 2750 fps range. A few completely came apart. Partitions always seem to work the same way, expand on the front back to the partiton, then keep penetrating. If you are only hunting plains game, either will work.
Charlie

The data and opinions contained in these posts are the results of experiences with my equipment. NO CONCLUSIONS SHOULD BE DRAWN FROM ANY DATA PRESENTED, DO NOT, UNDER ANY CIRCUMSTANCES, ATTEMPT TO REPLICATE THESE RESULTSj