What size blob do you have. May be interested if its the bigger one.
S.S. -- We use our older blobs for that. Pending on what type muzzleloader bullet you use, they wont even exit the thing. A rifle on the other hand, depends on what bullet you use. We've got some varmint hollow points that wont make it through the target (this being an old shot out one anyway) and some rounds like the Sierra Pro Hunters will go through and keep on keeping on. We've got a mud bank backstop and can tell which ones make it through and which ones don't. A .22 LR wont make it through no matter what kind.