Worst 2 performers on game for me have been Sierra and Berger.
Sierra 257 117g BTSP shoots lights out in both my 26-06 and 257 Weatherby, but on anything bigger than a fox they break apart and I had very poor performance at distance on Fallow deer, above 300 metres.
Same issue with Sierra 375 300g BTSP out of either my 375H&H or 375 Weatherby, simply break apart when needed. Both times, on Water Buff, the jacket was no where near the core, the core leaves the party real soon.
Any Berger OTM/EOL in any calibre has done weird things for me, especially when started above 3300fps. Weirdest thing is when they fail to expand correctly, one side gets a petal then the entire bullet tumbles. Had this happen at 660, 780 & 800 and recovered all of them bent like bananas and sideways in the animals, most were scrub bulls and the other was a donkey. I even had one pencil through on a Sambar deer at just under 400 the first year I used them. I had been cleaning tips the whole time too, so just WEIRD! I no longer use them.
Cheers.