Can anyone tell me the minumum Length of pull acheivable with the spacer system on the Choate Tactical??

it looks like a good option for restocking my wife's 12FCV. But compared to me at least she needs a noticably shorter length and I'd rather not fork over the cash (it's almost 2x the cost of the other option i'm looking at) just to have to send it back if it turns out to still be too long with all the spacers out.

Also if anyone knows how to measure the shooter get a legit hard number(s) as to what LOP (or range thereof) will be likely to give a good fit to a given person, I'd very much appreicate the info. the old standby method of "put the butt in the crook of your elbow and see if you can reach the trigger" isn't being all that fruitful at the moment, since i don't know the actual LOP of the stocks on the rifles we have that DO seem to fit her.

thank you in advance for any and all info you care to share.