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Pitbull - a 9mm Luger homemade handgun
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  backbencher

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Posted: February 25 2015 at 12:40am | IP Logged Quote backbencher

Fettling? Is that what we mean by limp-wristing?
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  Zuzzy

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Posted: February 25 2015 at 10:54am | IP Logged Quote Zuzzy

lutylover wrote:
This sort of engineering gets me, trying to fit disconnector etc in a few mil gap either side of a magazine - to me that's just genius if they can get it internal! I know blah blah blah big corporations blah but there's just something about an oppressed person fiddling this all out and getting this really awesome piece of engineering at the end! anyone with me?


Blah blah blah you should blah blah blah stop reading topics and admiring others and blah blah blah start doing something by yourself blah blah blah.
The creator of pitbull pistol surely didnt come up with all his designs just by making blah blah blah posts on the forums.
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  lutylover

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Posted: February 26 2015 at 12:44pm | IP Logged Quote lutylover

I am Zuzzy, that's why I've revived this thread

My primary project is something else, I'll write it up when finished but I prefer to not do build threads.

I'm looking at plans from this and trying to disassemble them and mix them a bit with the vol 1 Practical Scrap Metal Small Arms - my motivation came from my earlier comment about a box section pistol!
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  UKBiker

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Posted: February 26 2015 at 3:11pm | IP Logged Quote UKBiker

Forgotten weapons have just done a vid on the Walther MP a 9mm straight blowback pistol designed in the late 1920s and essentially a scaled up PP chambered in both 9X19 and 9X23 Largo, it looks a very interesting pistol and proves that a straight blowback 9mm pistol doesn't have to be heavy and unwieldy
Something like the MP would be a good idea no complicated locking surfaces and fixed barrel accuracy.

I like the Pitbull as it is quite a modular way of assembling it and would lend itself to both a welded construction or the pinned version
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  anthrax

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Posted: April 19 2015 at 8:50am | IP Logged Quote anthrax

hey great awesome work !!!

i have 2 questions.

first one is how did you ream the chamber? with a 8mm 1:50 taper pin reamer? or with a commerically one or did you make on yourself.

2nd is do you reload your ammo? if yes why dont you use the powder of the hilti blanks. in most countries like germany you can buy cases primers and bullets without license. for the powder you could take blank cartridge powder from hilti blanks
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  backbencher

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Posted: April 19 2015 at 10:12am | IP Logged Quote backbencher

Blank powder is not intended to drive a projectile, and tends to produce extremely high pressures when put behind a bullet. That's why anti-gun authorities don't tend to regulate blank powder - it's a self correcting problem.
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  anthrax

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Posted: April 19 2015 at 10:53am | IP Logged Quote anthrax

i dont think so about blank powder. maybe the pressure is higher.
but i have 22lr factory loads the only ones i ever got my hands on.
i pulled the bulllet an used the powder in my 9mil from the other thread.
it burned he same with the same amount of grains it also bulged the casing the same it even had the same exterior and penetrated the same amount of wood. also i got the exact content percentage from the blanks from the factory pdf. its double base 77%nc 23%ng and i looked up very fast pistol powders they also have up to 25% NGlike bullseye why should that be so different?
those nailguns also have to drive a piston and dont blow up.
i wouldnt use it for a rifle but that powder burns exactly the same like 22 powder. its also ball powder and i think i can use it in pistol ammo .
also orwell use this blanks in his smg look the vid up on youtube homemade 8mm smg. he stuffed the strongest blanks in a 7,62 and it works....
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  anthrax

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Posted: April 19 2015 at 10:56am | IP Logged Quote anthrax

why should the factory use bomb powder in there blanks. the nailguns also work with these. look up taofledermaus shooting pellets with 3000fps with nail gun blanks.
did you try it yourself? did you load a small amount in a gun and tested it?
yes the powder is fast it would propably blow a rifle up but the content is almost he same like very fast pistol powder. it even looks the same and it has the same energy i ccouldnt manage to realize a big difference to .22 powder
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  backbencher

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Posted: April 19 2015 at 4:08pm | IP Logged Quote backbencher

The problem w/ blank powder is that it's extremely fast burning. And you're trying to hotrod a cartridge beyond its normal limits. In the US, we very carefully work up a load with known powders, from manufacturers that hold tight quality standards, knowing that their customers need a very consistent pressure curve to keep from blowing their guns up.

So you're well beyond SAMMI/CIP limits in your 9x19mm, w/ an UNKNOWN powder whose manufacturer never intended it as a pistol powder. If you were using a much larger cartridge, like .44" Magnum, and trying to run it @ lower pressures, like .44" Special, you'd have a much larger margin of safety here. You're trying to run a smaller cartridge @ .44" Magnum pressures. It's not recommended.
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  UKBiker

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Posted: April 19 2015 at 4:32pm | IP Logged Quote UKBiker

Certainly with the materials limitations of expedient firearms design the pressures become more critical. Most manufactured firearms will use the correct grade of steels which have undergone the correct hardening processes for the application that they are being used in.
With Luty designs and others like Bill Holmes and the Prof Parabellum designs they are built to use standard widely available cartridges with known characteristics in respect of pressure curves and burn rates in barrels made of suitable materials and dimensions.

Hotrodding a manufactured firearm is fraught with problems just look how many revolvers Elmer Keith destroyed when he was developing the .44 Magnum and .357 Magnum loads, and he was starting off with S&W revolvers of extremely high quality rather than a homemade firearm constructed with whatever materials were to hand at the time.

It is the same sort of idea as tuning engines I wouldn't hesitate to shove a load of nitrous oxide through a Suzuki Hayabusa but I would have serious doubts about shoving the same amount of giggle gas through a Vespa 50 scooter, let alone riding the damn thing afterwards!!! It is pretty much the same level you are talking about doing with your homemade cartridges and firearms.

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  Zuzzy

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Posted: April 20 2015 at 8:26pm | IP Logged Quote Zuzzy

All these pressure talk depends if he is using unrifled or rifled barrels, since in the first ones, pressure is lower due to the powder not being capable to burn completely.

I would like to know the exact percent of fps or mps loss in barrels and cartridges compared, but havent found that on the net so far, nor have I seen some scientific experiments on the subject.
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  Siberian Cossack

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Posted: May 18 2016 at 1:12pm | IP Logged Quote Siberian Cossack

!
Hello! Great project pistol, I hope someday there will be bluprint. Regarding the equipment, ammunition and gunpowder that was discussed here, we have pistol powder too, not to buy. I for rig 7,6225 and 918 used the powder for shotguns(I have a permit for a shotgun and I can buy the powder for shotguns in the store gunpowder for rifles we have not sold the brand "Socol" and "Sunar 35"  "Sunar 45" (these correspond roughly gunpowder gunpowder sold in your countries -
 Nobel sport(A1;SP -8; 0)
 Accurate ( N 5 ; Solo 1250; N 5)
 Alliant (unique, herco, power pistol)
 Hodgdon (station Wagon ; long Activities; XC 6 and 7)
 IMR (SR 4756 ; 800 X)
 Vihtavuori ( N 330 ; 340 N ; 3 N 37 ; N 350)
 Rottweil ( P 804 ; P 803 )
    p/s Sorry for my English.

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