Funny you should ask, and my answer is yes. 3 years ago I bought 2 10round boxes of 3" Federal Heviewights in the #7 shot. Last year I purchased 3 5 round boxes of the same shells. I find that the 5 round boxes are about 20 to 30 pellets less when I was shooting at paper, in the 10".
Have been looking for more of the 10 round boxes but am not having much luck.
Wjy do you ask?