I use 350gn Taipans and 350gn Woodleighs in my CZ550 375H&H, ahead of 66gns AR2208. They are mild loads in my rifle and shoot accurately. I developed this load from one of the earlier Mulwex (ADI) powder guides - I believe it had the 350gn listed there (I can check if you like - should also show the expected velocity). I've only used these on paper and I think the Taipans may not perform well on larger game, but they are relatively inexpensive and accurate - good enough for small/medium game and paper targets.