As wmi states the difference in results is only concerning to competitive shooters. I ran a series of tests last year between std win 209, Win-ML 209 and the 25 ACP and the variation between groupings was next to none. I only ran the test on tight fitting sabots with a regemented cleaing process between shots. I suspect that groups would open up more on looser fitting sabots. All in all save your money unless your a perfectionist.