I used to be an avid ground hog hunter [every day] The ,223 is a .222 mag. It was the second smallest ground hog rifle cal. that you could buy. I shot a .22-250 or .25-06 for real long ranges. Any serious ground hog hunter wouldn't consider that cal. for over 250 yards. You are right, the "reason" listed to justify the change in caliber was so that they could carry more ammo. I served. No one liked the gun, we were not given enough training with it. We fired 100 rounds in basic training. If you didn't already know how to shoot, you were screwed. It may hit a target at long distance but at 250 yards, it won't even anchor a ground hog unless you hit him in the head.