in case it hasn't been mentioned. you need to use soft lead to slugg your barrel. your alloy will be a pain to slugg the barrel with. stickon ww's are almost pure lead so you could take say a old soup ladle and a torch and melt enough to fill your mold with for a slug.
22LR,17hmr, 9mm, 9mm makarov, 38 S&W, 38/357, 41mag, 44mag, 45ACP, 7.62x39, 7.62x54, 222rem