I must have a bunch of metal scrappers in my area, It's so dang rare to find pewter anything at the thrift/junk/antique stores. I think I have 3 candle sticks in my garage, next to a pile of Lead scrap, awaiting smelting. Those 3 candle sticks were found at different times over the course of about 3 years.
Back to the OP's topic.
my first score of tin, was ordered from a CB member in WI, lead-free Solder that he cast in large muffin ingots. I remelted them and cast them in a Lee 250gr REAL mold...yeah, timing the sprue cut, taught me to not try that again. I also saved the sprues for the benefit of having various weights.
ANYWAY, the lesson I learned was implemented the next time I got a batch of Tin (beer cooler line that time), I just poured the melted Tin into traditional ingot molds (1lb if Lead) and I only poured the ingots to less than 1/4 full, so they are thin like a saltine cracker.