My summer blend (live in Florida) is 6 parts Mutton Tallow, 1 Part Beeswax and 2 Parts Olive Oil. Use this to lube over the chambers and to lube conicals. Have also melted it down to lubricate wads but Prefer to leave out the Olive Oil for that mix.
Mutton Tallow from what I've heard is tops, it's hard to come by down here so it's ordered from DGW. Bear grease is also very desireable and have heard of fellas of rendering the fat from their deer kills and when done proper it didn't go rancid. My Mutton Tallow is a year old now, whether in the mix or straight from the jar it has not gone rancid and has been kept at room temperature.
