Privi Partizan

[evilmonkey]

Anybody use this stuff? I bought 200 rounds of 75 gr match Privi for 9.90 a box figured I would try it out. I haven't used this stuff before so I figured what the hell its pretty cheap for match ammo. Anyone have any experience?

[Iraqgunz]

Evilmonkey,

Scrow down to the thread started by zippygaloo (Prvi Partizan) and you will see a few posts concerning the PP 75gr. ammo.

[Molon]

100 Yard Accuracy Evaluation of Prvi Partizan 75 grain Match Ammunition.

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The Prvi Partizan 75 grain match ammunition uses an open-tip-match bullet very similar in configuration to Hornady’s 75 grain BTHP bullet used in Hornady’s TAP line of ammunition and in Black Hills’ 75 grain MHP line of ammunition. The Prvi Partizan (PPU) bullet has a nominal length that runs approximately 0.010” – 0.015” shorter than the Hornady bullet. The PPU 75 grain bullet does not have a cannelure, but the case mouth on this load does have a slight collet crimp on it which puts a slight crease in the bullet.

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The PPU 75 grain match load uses Boxer primed brass cases and is charged with “ball” powder. Neither the primer nor the case mouth have sealant and the primer is not crimped. Previous chronographing of this load through multiple barrel lengths shows it to run an average of 127 fps slower than the Black Hills 75 grain MHP load.



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I have read some statements recently that claim the PPU 75 grain bullet was designed to shoot well through 1:9” twist barrels, yet none of those making these statements have provided any scientific evidence to support this claim. According to the Greenhill formula, the optimal twist for the PPU 75 grain bullet is 1:7.6”.

From a 1:9” twist barrel, the PPU 75 grain match bullet has a gyroscopic stability factor (GSF) of less than 1.25 for all velocities. It is generally accepted that a rifle bullet should have a GSF of 1.5 to 2, with 1.25 being the least acceptable GSF.




Gyroscopc stability factor from a 1:9" twist barrel.


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Gyroscopic stability factor from a 1:7.7" twist barrel.

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The test-vehicle for this evaluation was an AR-15 with a 24” stainless-steel Kreiger VarMatch barrel, with a 1:7.7” twist, installed on a LaRue Tactical Stealth upper receiver. A Leupold Competition Series Scope was used for sighting. No malfunctions of any kind were experienced during testing.


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Following my usual protocol for accuracy evaluation, shooting was done from a bench-rest at 100 yards. Three 10-shot groups were obtained using the PPU 75 grain match load. Those three groups had extreme spreads that measured:

0.66”
0.92”
1.14”

for an average extreme spread of 0.91”.



The best 10-shot group from 100 yards.


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The three groups from above were overlayd on each other using RSI Shooting Lab to obtain a 30-shot composite group. The mean radius of this composite group was 0.29”. For comparison, this composite group is pictured below next to a composite group of the Black Hills 75 grain red box MHP load as well as a composite group of one of my handloads.


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Chronograph Data for Prvi Partizan 75 grain Match Ammunition


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Chronograph data was obtained using an Oehler 35-P with "proof screen" technology. All velocities listed are muzzle velocities as calculated from instrumental velocities using Oehler's Ballistic Explorer. All strings of fire consisted of 10 shots each.

Three different barrel lengths were used in testing: 20", 16" and 14.5". All barrels were of Colt manufacture, with chrome lining, NATO chambers and 1:7" twists.


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atmospheric conditions:

Average temperature- 83 degrees F
Humidity - 64%
Barometric pressure – 30.04
Elevation- 960 feet above sea level



Prvi Partizan 75 grain Match; Velocity Update




Here's a little update on the velocity aspect of the PPU 75 grain Match load. One can't help but wonder if Prvi Partizan has been listening to its customers. About the only complaint anyone has had with this load is that it has a lower muzzle velocity than the Hornady or Black Hills 75 grain loads. I recently chronographed the latest lot of the PPU 75 grain Match load that I have on hand and from a 20" Colt A2 barrel it is running approximately 117 fps faster than the original lots of this ammo that I chronographed!


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[DM-SC]

100 Yard Accuracy Evaluation of Prvi Partizan 75 grain Match Ammunition.

Nice first post! :cool:

[markm]

Nice first post! :cool:

It would be nice to see Molon post some more over here. He's from TOS, but he's one of the good guys.

[evilmonkey]

Damn Molon :eek:good write up I appreciate all the info I think Im going to buy another 600 rounds of this stuff. Thanks for taking the time to post that!

[Parabellum9x19mm]

fantastic. thanks for all the data and all the hard work that went into obtaining it.

[Spurholder]

That was an awesome write-up - thanks!

[Iraqgunz]

Molon,

Good post. Keep it up!

[jcase64]

Excellent, can this be sticky'd?

[Razorhunter]

Is there a way to know how old your PP 75 hp ammo is? I bought a good bit of it a couple months ago? I think?, and I don't recall if there is a date stamp on the battle packs, or individual boxes or not???
Any way to know if one has the newer "hot" stuff, or the older stuff??? (IF all of the newer stuff really turns out to be hotter indeed)

[Molon]

Is there a way to know how old your PP 75 hp ammo is? I bought a good bit of it a couple months ago? I think?, and I don't recall if there is a date stamp on the battle packs, or individual boxes or not???
Any way to know if one has the newer "hot" stuff, or the older stuff??? (IF all of the newer stuff really turns out to be hotter indeed)

The "newer" lot that I chronographed had a lot number of 0801-18. The lot number was found on a slip of paper inside the box. Unfortunately, I did not record the lot number for the first lot that I chronographed.

[Razorhunter]

Ok I gotcha. I just checked all of mine, which was purchased 3-4 weeks ago? and it's from "0803 62"

Thanks.

[MyDogsBoss]

Mine got here a few weeks ago - 0806 17 - so how do you transalte these #'s anyhow :o I'm still learning,thanks!

[Iraqgunz]

My understanding is that 08= year, 06= month and 17= day or it's a sub-lot designator. Military ammo is decoded like this.

LC-05L380-638

LC=Lake City (Manufacturer) 05= year of production L= month 380= Lot interfix number 638= Lot sequence number


Mine got here a few weeks ago - 0806 17 - so how do you transalte these #'s anyhow :o I'm still learning,thanks!

[Artos]

I noticed Wideners had some and wanted to give it a shot....glad I did a search.



Anyone shooting the stuff they have on hand?? Seems like a fair price.....is their brass decent for multiple reloads??

Thanks!!

[markm]

The brass is great for reloading. You have to remove the crimp, but it's great brass.