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That's why I encourage interested shooters to try action pistol shooting.
The games will force you into less-than-ideal conditions.
Ever tried shooting flat on your back?
Yep. I've tried shooting from my back and other, uh, interesting positions.

I have some pics of me doing so in training, but it's on my home laptop (not on my phone).
I very much agree with you on the "less-than-ideal" conditions part, including having your heart rate up and your mind and body not in the calm and controlled environment at the shooting bench/counter of a target range. I also encourage people to try IPSC/USPSA and IDPA (where available). I used to shoot IPSC and am planning on getting back into it. It's really fun for me. That said, if someone is getting into it for strictly the "gun games" part of it, fine. If they are getting into that for defensive situation training, I caution people that there are aspects of gun games that they need to keep in context. Stuff like dropping partially full mags, which I admittedly do, particularly to have a full mag going into the Texas star.
Yes.
This is why I get irritated when I see EVERYONE getting taught only isosceles stance, and being told they NEED to stand this way. Different body types and/or other physiological limitations might not make that ideal for each individual; same goes for grip.
Personally, I prefer to shoot pistol in weaver and rifle in isosceles.
I recently coached someone who was most comfortable and accurate shooting their rifle in the WWII chicken wing, and can't for the life of them shoot in isosceles without feeling off balance.
Another individual I coached is more comfortable shooting in a more traditional European rifle stance for both rifle and pistol.
What irks my chain more is when people tell you to stand a certain way, and can't give you a scientific answer when you ask why.
I will teach both stances and encourage people to try both. I just don't want them mixing and matching too much at first (bladed shoulder with square lower body and vice-versa). After they've tried the "text book" isosceles and weaver, if they find themselves comfortable and shoot well in other stances, great. Maybe not for me, but I'm also of the mind of "doing whatever it takes" for that person.
One situation where I will advocate for isosceles is when someone is cross eye/hand dominant. That said, if they try my way and they insist that they shoot better Weaver with their head/neck craned awkwardly, then

In a way, that's why I enjoy working with new or women shooters. They tend to be more open to trying different things and receiving suggestions. I've had so many "I've been shooting longer than you've been alive son" and can't hit squat and insist on holstering their handgun while holding the slide because "that's the way they've always done it".
