No worries, the partitions have been around for a very long time and you don't hear to many horror stories about them. They are designed to open up quick after impact to create a good wound channel then when the expansion reaches the partition the remaining bullet can penetrate deeply. I have shot a few deer with them in my 7mm Mag with good results and we have used them a lot on deer in the 85 gr weight in 243 also with good results. In the 270 Win the 130gr bullet is great. I think they would be better allrounders than the 154 Hornady as they are a controlled expansion bullet but in saying that you have had good results on scrub bulls with the 154gr bullet so who knows, only one way to find out do a comparison of the two. The ORYX is meant to be a tough bullet so should be ok on Bulls.
Good luck keep us posted chuck in a few pictures of the bullets performance on the bulls , would be real interesting.
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