There would be several reasons to do it.
• The bullets available are smaller than optimum.
• Wads might not have been available.
• Better gas seal than wadded up blanket material or natural fibrous materials.
• The likelihood that some people’s guns would have shot them just fine.
"The bullets are smaller than optimum"
OF course this presupposes that they would've known this..., that an optimum bullet size was somehow "needed", AND if the bullets were smaller than optimum, ..., for the patch to "work" they would have to be only slightly smaller than optimum...
"Wads might not have been available"???
You mean they ran out of leaves or wasp nest or moss to dry?
"Better gas seal than wadded up blanket material or natural fibrous materials."
AH yes of course, they understood that from birth, I forgot....
"The likelihood that some people’s guns would have shot them just fine"
AH a supposition, based on zero.... well based on conjecture... they'd spend the extra dollars on cloth, to destroy with each shot...., when it wouldn't have made enough of a difference to justify the expense..., with those too small bullets and all....
LD