Actually just the opposite! The Barnes bullets didn't do anything but punch caliber sized holes in the animal generating very little tissue trauma. Needless to say the animals didn't go down quickly (even with heart shots, as I had one bull stand around almost two minutes with the bottom of his heart "ventilated", it took a second shot to drop him). The Woodleigh 340 gr are very good bullets, but not enough better than the 350 gr Speer. I seldom use the Rigby anymore anyways as it has never really impressed me. One day it will undoubtedly become a 50 caliber of some sort. I am glad that the Barnes have worked well for you.

My primary hunting rifle is a 500 AHR (500 Jeffery Improved if you will). It is night and day better at dropping things with one shot than the 416 Rigby. I use three different loads for anything from squirrels to buffalo. They are based upon bullet weigth (535gr, 570gr, and 600gr all Woodleighs).

Regards,
Scott