"So..............in other words, you're saying his hunting success has more to do with bullet shape/type that his shooting/hunting skills?"
Yes and no. If you read his articles, he spends much time discussing bullet failures and what bullets work and why. He did use JSP bullets for hunting and his "Keith" bullets. If Elmer were alive today, he would be impressed at the premium bullets that are available. Hard cast bullets with large/max meplats are not for everybody.