A heavy recoiling gun will recoil itself off the target. The energy pushing the bullet will move the barrel.My response was meant for Form but I'll entertain.
The above statement is In your opinion.
That still doesn't answer my question though. What was the motivation for trying initially? And through that trial and error process of trying to find the minimum that would "kill just as efficiently", were any animals lost or wounded? I'm guessing you weren't pioneering this trend so I don't expect an answer I just wonder why...
More accurate is a pretty broad statement that takes for granted way too many variables. Easier to handle, lower recoil, etc. should really take that place in the argument imo. Remember, recoil happens after a bullet has exited the barrel so it has zero bearing on the accuracy of the rifle.