Figuring weight

[Elsbet]

So how do you all figure weight on your goats? I know how to measure for heart girth on dairy goats, but the charts say that it doesn't work on minis, hair goats, or meat goats. I have a pygora doe (I'm figuring 60-70 lbs right now, but could be way off) and a possibly Boer cross buckling, who is probably currently the same weight as the doe. Since my Saanen is still up on the other farm, I haven't checked her weight, but she should be easy peasy to figure. (eyeballing her, I'm thinking 150lbs+- she's a big girl, but thankfully super easy to handle.)
How would you suggest I check the other two? I don't want to screw up on dosing them when I need to.