No personnal experience with the early versions, but a good friend of mine Ed Stevenson guided Randy on ,which might have been one of the first usage of them in 375, as I recall. Ed put Randy on a good size brown bear in Gravina Bay, Alaska. They were in an inflatable just off shore , the bear was cruising the beach. Randy hammered the bear good but he didn’t go down so Randy hammered him again , and again and again , the bear was well hit but just didn’t want to expire, after finally figuring out where his tormentation was coming from I guess he (the bear) came in the water after them, but thankfully expired. I guess when the smoke cleared, 8 or 10 rounds later, Ed looked at Randy and said something to the affect back to the drawing board huh Randy. Guess the bullets were just to hard and didn’t expand well. Next time Randy and Connie got together with Ed they had it pretty much solved. The shooting industry owes Randy and Connie a debt of gratitude.