Mutton/sheep fat (tallow) has always worked well for me over the years. Also great for making lube for bullets, mix it with the proper paraffin and olive oil. I'm not interested in trying to be 'old timey' and get raw bear, deer, sheep, or whatever fat and mess around rendering it down. Buy the sheep tallow in tubs and free from all of the mess. There were sheep in the 1700/1800's and those boys made use of the fat, if they had access to the rendered fat in tubs they would have taken advantage of it I'm sure.