We're talking physics here. Facts are what matter, not "experience". You don't learn how to make a bullet shoot deeper. It either does or it doesn't.

Now, you can learn to shoot game in the ass, and it's quite clear you have. Bravo. That's experience, and you've got it.

I know you'll never provide the answers to my 3 questions, because they would embarrass you:
1) What was the penetration? A number of inches will suffice.
2) What bones were hit?
3) What was the retained weight of the bullet.