Golly Tin cup, you were not kidding! I finally had some nice "casting weather" here in Central Texas, free of rain (I'm doing this out of doors...). I've got a skirmish coming up in late May at LaCoste, Medina County, TX. I'm going to use a rifled and sighted .69 cal. Model 1842 that I had re-lined by Hoyt. I got my lead really, really hot. I made about 75 or so wadcutter Minié/Burton balls made, then switched to about 40 or so .670 round balls. Then I tried to make some of these here Nessler NC state-issued balls. I'd think about 3/4 or so had to go back in the pot. It is challenging to make these, even with really hot lead. I'd let the molten metal "pool" on top like normal so as the bullet cooled it would have a bit extra, but in the Nessler's case, it would just slurp all the metal on the top down into the mould and still come out wrinkled! Thus far I've only got about 7 of the so-called Nessler's made.
I've also been researching Civil War ammunition and weapons, and I did find a case of Iowa volunteers who were given .69 smooth-bores, but then got the full-house 730-grain Minié/Burton backed by 70 or so grains of powder, even though it was for rifled muskets. So when I get to testing these--after making many, many more of course--I will try them in both smooth-bored and rifled .69 arms, if I can get them sized.