I have fired a lot of nail gun loads through a .22 rifle with no damage to the gun.
The loads availible in this area are mostly power level 1,2,3,and 4. Power level 4 will drive a 3 inch nail through a 2x4 into concrete 1 1/2 inches,power level 1 is the weakest.
My testing with the power loads has been remotely fired where there was no possibility of injury should the gun fail. Level 4 loads will blow the rim completely from the case with all bullets I tried(30gr.,40gr.,and 50 gr.).Level 2 loads were the only ones I could fire without splitting the rim
then only with a 30gr. bullet.
Even level 4 loads will not cycle the action of my semi auto when fired as a blank,the breeckblock only moves .010-.015.I have fired many level 4 loads as blanks in my singleshot bolt action J.C.Higgins.I use the level 4 blanks for wing shooting wasps and carpenter bees.The blast of gas will kill them to about 5 feet away.
I have never fired the .25 or .27 caliber blanks and probably never will.
It is to dangerous to fire nail gun loads in a fire arm with projectiles except in controlled experiments.
I am not advocating using nail gun blanks in a firearm for any purpose
because of the possible danger posed,I am merely relating my experience with them.
WC