Using a hackamore properly can’t be done by the seat of your pants and do it right, I have learned.
You need to watch those that do it right and better yet, have them show you.
I have had people ask how to.
I do show them, have them hold the rein with me and get a feel for what it takes and what not to do and, once they have the concept of a light signal and the much more important of the release, they are good to go experiment on their own.
Very hard to put a bosal on and go ride and not make way too many mistakes.
Those will get a horse bracey.
The same principle applies to riding without a bridle but with something around a horse’s neck, that light touch and more important, release and never keep whatever you use tight is extremely important for those kinds of signals to work consistently.
You have to ask right and trust your horse to do it, not try to help or hold them up with them.
As someone already mentioned, that kind of riding is about no direct contact, only a very light touch when asking.
If you have to pull a horse around with a hackamore or something around their neck, you are already fighting the horse, not guiding, if you know it or not.
Another very important point, the rest of your aids, that are active as you use whatever you use on their head or neck to guide, your weight/seat and leg.
The heavier the bosal you use, the more you have to be aware that, if not an exact fit, they will go bump-bump-bump on a horse’s nose as they move, especially at the canter and that is not good.
If that happens, the horse will get first sore, then desensitized to a fine feel in those sensitive areas and the nose structures develop a callous there and some times under their chin.
You can see that in ranch horses someone that didn’t know any better tried to use a bosal.
One more, many bosals have the cheek piece slot a bit too far forward, so any the bosal may move around will make those side pieces hit the horse’s eye on one or the other side, irritating it.
You can see that happening with those, made like that so the heavier bosal’s will hang right, the weight of the back keeping them up in front.
I really don’t like the thicker, stiffer rawhide bosals much, prefer our own light rope nose hackamores, that Pine Johnson used and taught all to use, after several discussions with Don Dodge about them and the Californios that used them.
That kind of CA vaquero riding is very specific and few can become really good, while many are worse off by trying to emulate them, just because it is supposed to be an old tradition, without full understanding of what was good about it and what some pitfalls were.
Some old traditions were worth keeping, some not as good as newer ways of doing things.
Today’s followers of the Vaquero tradition, even when they like to think themselves purists, are really so much more educated in how horses work and move than the old ones were, that there is no comparing the results they achieve today to the older, so many times u-necked, stiff as a board horses that kind of training tended to produce from most but a few really fine hands.
Look at the pictures and drawings of those horses, look at “The Hackamore Reinsman” drawing in the cover, that was put there as a best example of a horse up in the bridle.
Then realize those horses were maybe not ridden always in a way we would accept today as correct.
Study the pictures here and educate your eye to what is a horse well developed to move correctly and which ones are not, but bracey and stiff and why:
http://www.hackamore-reinsman.com/