Can't remember if I have put this on before or not, but I shall post it anyway. Point Blank is a free download, and one that I find excellent for my use. It is designed for those reloading hunting loads so will not contain all the bells and whistles of target ballistic programme that you have to buy.
Just follow the link and on the right hand side of the home page there is the link to download. Try it what harm can it do.