I was wrong.....10 shell box is 3". I bought some 3.5, 2.25, #6's lot #300076 today. I shot 3.5, 2.25, #7 at 40yds today put 262 in the 10".....3.5,2.25, mag blend at 40yds put 209 in the 10". Temp low 70's, dirty barrel, not cleaned in a couple yrs. What do y'all know about #6 lot #300076