I'm looking to buy a cheap A/P or close contact saddle to practice in and maybe do some showing in until I have the money to buy a better one (the barn I'm at only has dressage saddles). There's a lesson barn near me with somewhere around 50 used saddles each for $35 A lot of them are in really good condition and I'm super excited to go look at them However, since there are so many and it's just a low-key lesson/camp barn, no one knows off-hand the size of the saddles. I know that some of them will have this printed somewhere on them, but a bunch of them probably won't.
So: how do I measure them? Where's the best place to start & end to measure seat size, and how do I go about measuring tree width? What do I measure between and what is the average cm size of a medium tree? Is there anything else I should be looking for, such as gullet width (is the three finger rule a good one)?
I don't want to walk away all proud with a decent saddle I only spent 35 bucks on just to find out that I picked a ridiculously narrow or wide one and have to buy another.