aseedylot wrote: I have been casting with a coleman stove ,,,, but I do have a number of wrinkled bullets. I am assuming my casting temps are a little low.
I used a coleman stove for a while when I was too broke to buy a lead pot, and while it did work, it tended to run on the cool side.
Wrinkles are definitely a sign of the mold or pot being too cool (unless there is significant oil contamination, which can also cause wrinkles).
Brass molds have more personality than aluminum molds. Some of them cast great, noticeably better than aluminum, but others are mediocre casters. I would say it's a toss up for the caliber and weight that you are looking at.