According to McKee and Mason's book, Civil War Projectiles II Small Arms & Field Artillery, on page 66 it list:
2.38" Dia. 1.8 Lbs. Grape for 18# Gun - 9 shot per stand.
Besides, Confederate balls, including 12# and 6#, have the seam and sprue marks visible. The infromation shown on the web page is US standards. That dosen't mean that confederate standards were the exact same. There are cases in confederate ammuntion where there were more balls in a canister round of smaller caliber than the standard 27 in a US round.
At Cheraw, SC I have taken the same identical balls as well as 6# and 12# solid shot and shells out of the Great Pee Dee river where they were dumped by the Confederates when retreating from Cheraw.
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