I am surprised you can't get a RN Woodleigh to expand on a boar or a Red deer.

I wouldn't expect golf ball size exit holes but I would
expect them to expand.

I have use them out of a 375 before and I also did extensive testing on the 286 and 300gn 9.3 Weldcore which uses the same jacket. These tests were at very low to very high speeds to
see what the performance was. The RN open up at almost any speed because of the large amount of lead showing.