[stoky]

The old versions of these were pretty dangerous if you didn't watch what you were doing. The color codes are for different powers. The operator had an additional variable of how far the nail was seated down the barrel, there was a depth gizmo for this.
I was on a job when a guy was putting wooden nailers on top of I beams for a commercial deck. He was standing on a ladder and pulling down on the nail gun. He put the nail through the 2x and one side of the I beam and into his thigh and out his calf. Didn't see him back on the job.

 

[stoky]

IMHO (guessing) they could be used to make noise. If you feel like you have to add a wad to make sufficient noise, be very careful. Firing a projectile of any sort should not be attempted.

 

[stoky]

did a preasure test with one of the junk .22 rifles i have laying around and it seems to be doing fine.
TXS

So far so good. Stick the rifle in an old tire and pull the trigger with a string from behind a tree.
test away
but

Ya they say that about a lot of things just like it isnt safe to fire 5.56 out of a .223 camber and its not safe to fire .357 in a .38spl chamber but all the same people will do it any ways.
TXS

It really (REALLY) isn't safe to fire a .357 in a .38 special chamber. RNGR3

 

[stoky]

Common sense is learned. Stupid is forever.

and Darwin Award glory is fleeting

 

[stoky]

In theory there's no difference between theory and practice, but in practice there is.
--Yogi Berra

Factory .357 magnum shouldn't fit in a .38 Special. Most American manufactured wont.
.38 Special max overall cartridge length is 1.55"
.357 case length is 1.29"
So you could (not should) seat the bullet in a .357 deep enough to fit a .38.
I have a vague recollection of obscure revolvers (RG?) that had long enough cylinders in a .38 to accommodate some .357 Magnum ammo.