Could be from the cloth patch used when the round ball was fired, I doubt striking cloth would leave the imprint. The other side of the ball appears to be the side that impacted.
A properly fitted, patched, pure lead, soft (because it's pure lead) round ball, when used for a bullet in a muzzleloading firearm, will many times, when fired, leave an imprint of the patch on the soft lead ball. It's not from striking cloth, it's the lubricated cloth patch that is around the ball, between the lead and the powder.
great thanks for the info, i don't know enough about muskets to know if it was possible for a patch to do that in the firing process... now i know. thanks again
The ball in the pic is impacted against something soft as it is misshapen, possibly the intended target this is not from the cloth/wad applied to the ball for sealing it snugly in the rifle.
I have a few thousand 1812 ball and NONE of them has an imprint from fabric....HH.....Bonz
If those are military musket balls from the war of 1812 they would not have patch imprints as military muskets were fired with a bare ball, not a patched ball.