say my name three times, and here I am
The hirtenberger +P+ 100 gr. SP I have here is "HP 9mm LUGER +P+"
It is wimpy.
CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.
1) 9mm is 35,000 psi max pressure
An example of this pressure would be 7.83 gr. AA#5, 115 gr. JHP
2) 9mm +P is 38,500 psi max pressure
An example of this pressure would be to add 3.7% extra powder, 8.12 gr. AA#5, 115 gr. JHP
3) 9mm, the pressure level I do all the time with my P11, an example would be 27.7 % extra powder, 10 gr. AA#5, 115 gr. JHP pierces the primer and makes the case bulge in the shape of the feed ramp.
4) 9mm, the pressure level I DO NOT DO VERY MUCH in my P11, 36.6% extra powder, 10.7 gr. AA#5, 115 gr. JHP, hole blows in case.
5) 9mm, The pressure level I DO NOT WANT TO EVER DO AGAIN IN MY P11, 46.9% extra powder, 11.5 gr. AA#5, blew case head off, blew bottom plate off magazine, blew extractor out of gun, blew hold open out of gun, had to wait for parts to arrive from Kel-Tec.
Here is a picture of the brass from 3,4, and 5:
http://www.thehighroad.org/attachment.php?s=&postid=236652
My P11 is fine now, and I only shoot overloads in it.
But when someone asks if they will hurt their gun with 3.7% extra powder, I really have to laugh. Big corporations with risk averse lawyers are selling +P 9mm, because they know of the mountainous safety margins with 9mm ammo.
The parts that have been replaced on my P11 are the extractor, hold open, and magazine bottom plate. That was the 5) shot described and brass picture in the above post, back in 1999.
Since then I have tried to quit a work up when I see a case bulge. If a primer pierces, sometimes I will try a magnum primer.
I also try to stay away from overload work ups with AA#5 in all guns except '98 Mausers.
I have probably fired 100 factory rounds and 200 overloaded rounds in my P11 in the ~6 years I have owned it.
My favorite P11 load is to ream out the throat on a spare P11 barrel so it will take 158 gr. .357" XTP bullets seated out to 1.169". Loaded to 8.5 gr. Power Pistol, it will pierce the primer, but if the powder is double compressed so the bullet is not squished, and the loaded round is re sized without a decapping stem, then the round can be loaded to 11 gr. without primer piercing [more than a double charge based on 35kpsi max load]. That is now my favorite P11 load, but I suspect more power is possible with 800X.
The noise, recoil, and flash from the 11 gr. PP 158 gr. load is so bad in a P11, that is more for this fanatic that good self defense, unless you are in Grizzly country.
One reason for posting this kind of outlandish behavior is to reign in all the +P questions.
What does it all mean?
1) +P is 4% extra powder
2) 29% extra AA#5, and close to blowing a case
3) Over 100% extra Power Pistol and it just kicks harder and harder.
4) That P11 is one tough little gun.
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