I want to start of saying this is not a knock on nsa at all just what noticed and wanted to see if any others have noticed it as well. I have my impact .30 setup to shoot the 49.5gr nsa slugs at 1020fps and it was shooting lasers at 100 yards shooting broken clays on the 100 yards birm at my club using my atn scope. Moved the atn to another pcp and wanted to finally dial in my day scope a crimsontrace 5-25. Dialed in at 25 just so I wasn't chasing it at a farther distance after mounting the new scope got it spot on at 25 than 50 than 100 yards. Ran out of slugs so opened up my new box and the slugs looked completely different so I loaded them up and gave it a try right off the bat they are now shooting 980fps fired a few more and same consistent for sure but not where I was and now the groups opened up too. I am going to give the barrel a clean and try them again but I may be on the search again to see which nsa slugs my gun likes just when I thought I was all set. Again no knock on nick at all its just my setup does not like the new design the older design is the flatter one.