I have recently acquired an original 1886 Winchester custom rifle in 45/70 that is in 90% condition and I am putting together the components to reload for it. I am thinking of using Trail Boss, I have plenty of brass all I need to determine is what boolit sizes I will be using. I have a Lyman mold #457193 which casts a 405gr boolit, but I am afraid of having too long of a COL with such a large projectile (or compressing the charge). I know I have other molds around but have not yet found them. There is also the problem of making it too long and getting the cartridge jammed in the action (I have been warned not to do this), so does anyone have some good advice for me on this?