Those look pretty keen. A lot of folks use wax to fill the ends. The thing I don't fully understand is your parent case. Why the .444? Why not use the .460 S&W instead, probably negating the need to cut the case and also allowing for a tighter fit in the cylinders? A .454 Casull could also be utilized, which would for sure be easier to obtain.
An evil snake accosted my daughter out by the old cow shed the other day but unfortunately the dread viper had hid by the time I made my next round armed with the Governor. The thing actually reared up and hissed at her.
