I had a theory about 3 yrs ago that modern italian barrels patterned 24g better and had discussion with a few trap shooters of note, most agreed and one perazzi efficianado (poss spelling error) confirmed definitevly that he knew for a fact that this was the case and had the info from the horses mouth. Since the 24g trap rule all b and p barells were made specifically for 24g, apparently. There is no doubt in my mind that both my 10s shoot 24 better but still feel like I am missing 4g when shooting abt.