So the extra 2" gets you a tad under 50fps compared to my 16" with the AAC. I thought it would be more, and am pleasantly surprisedI just picked up a new Athlon chrony from Europtic and shot a few rounds of AAC 77gr TMK after shooting some 22lr out of my T1X. The AAC averaged 2616 out of a 18” tikka 223; 50f and 1k’ sea level.