Draw speed and the fact that you're crossing a lot of your own veins and arteries while drawing from a shoulder holster are two big arguments against them
That to me is the single biggest drawback of a shoulder holster, and why I've never tried one.
The class I took to get my carry license started banning them for the shooting portion of the class, back in '05, when a student had a negligent discharge when drawing from one of the horizontal types. The instructor said he heard the crack and felt the shock wave of the 9mm pass inches from his right ear
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What I really want to know is: does anyone actually conceal full-sized guns on hip holsters on a regular basis here?
I really just don't see how it would be possible to hide a 1911-size weapon on your hip without suffering either extreme discomfort when seated, or severe printing. I've tried so many ways to do it and it just never works. I'm talking years of experimenting with all manner of bizarre leg-strap contraptions and whatnot.
Yes, all the time. The smallest gun a carry IWB is a S&W Model 66 2.5". The largest is a 4" S&W Model 28 (N Frame), also carried IWB. In between are a 4" S&W Model 19 and a 5" 1911.
The single most important piece of gear is a stiff gun belt. I can say with near certainty that carrying a full sized handgun with a cheap, floppy $10 special from Wal-Mart just won't work. I found a 1.5" wide belt from thebeltman.net works the best for me. They cost around $80, but they are worth every penny. They hold up well too, I've had mine since 2007. I figure I can get a another 2 to 3 years out of it at least.
Next is the holster. My personal preference is for leather. For the 1911, my favorite is the Gary Brommeland Max Con V. Fantastic holster, google it. They aren't as well known as others makes, but they are very well regarded.
I also really like the Milt Sparks Versa Max II, also an IWB type holster. I have one for my 4" Model 28. I also have a few FIST #20 IWB holsters that work almost as well and cost a little less.
Though the N Frame does get a little tiresome after 12 hours, the others are quite fine. The 1911 is probably the most comfortable since it is pretty thin, while the 2.5" 66 is the easiest to hide with its round butt frame and S&W magna wood stocks.
If the gun/holster aren't positioned right, they can be painful. You just have to play around and experiment with the positioning. 2:30 seems to be the best for me.
For the car, I modified a cheap nylon holster (turned the belt clip 90 degrees) and attached it to the lap portion of the seat belt while driving, making a cross draw of sorts. At my friend's farm, I practice drawing seated (in a chair, not my car, LOL) with my right/strong hand while putting my left hand on my right shoulder so I don't sweep myself. Works very well for me.
1911, beltman belt, Gary Brommeland Max Con V Holster:
And for the record, I am 6'7" and about 200 lbs.
2.5" S&W Model 66, FIST #20 IWB: