A friend has asked for me to do some reloading for him and his son, they both own 45-70 encores. They want to load lighter bullets cause the recoil is too much with the 300 plus bullets. The plan is to take some Thompson saboted bullets that are 45 caliber on the OD of the sabot and have a 155 grain 40 caliber bullet already in the sabot and load them in 45-70 cases. They are most likely for black powder (haven't seen them yet) and I am wondering if the sabot is the right diameter for the 45-70 barrel? If this ever evolves to the actual loading stage, what powder and charge weight would i use, as I assume that this may have never been done before and no data is available. Also, they asked about a lightweight cast bullet they could find nothing on the web for sale less than 250grains. Does anyone make a bullet or molds for .458 in the 180 -200 grain range?