This is a discussion on PPU Prvi Partizan 168gr HPBT Match within the Ammunition forums, part of the M14 M1A Forum category; I've been shooting this round for quite some time now. I've also been doing searches on the Internet and this is the only forum where ...
I've been shooting this round for quite some time now. I've also been doing searches on the Internet and this is the only forum where 99.9% shoot .308 (7.62 NATO) so I decided I would post my findings at the range on this forum, if you don't mind.
It is really pretty simple. I used a Prochrono Digital chronograph on a rare overcast day.
The factory advertised velocity and BC is 2608 fps and .446, respectively, which is fine because I was able to duplicate the same external ballistic result (bullet drop) with both the factory claims and my own findings using PointBlank and Sierra Infinity v6 software. I confirmed with PPU-USA that they use the Standard Metro System to calculate velocity and BC.
Also, some more data per chronograph.
Muzzle Velocity Standard Deviation: 21 fps
100 Yard Velocity Standard Deviation: 10 fps
Thanks for the bandwidth and I hope this information is useful.
My last batch was through Midway USA. I just keep an eye out for it and get it when I can and keep stocked up.
The .463 BC is from using the PointBlank software BC calculator and that is what I used for Pointblank. A long time ago an ammo dealer selling PPU bullets calculated the BC as .480. Sierra Infinity uses more variables. Ironically, that is the BC (.480) that is needed when using Sierra Infinity software based on current conditions. The higher BC makes up for the slower velocity with bullet drop.
EDIT: I forgot to post the temperature outside yesterday when shooting was 77 degrees.
Last edited by culpeper99; September 26th, 2010 at 04:23 PM.
Thanks for the tip on the Privi, I'll look there! BTW, Joe, if you hang around here too much you'll probably develop that dread disease Mfourteenitosis or even worse, Garanditis. They're both very contagious and creep up on you. No cure is known at this time..............................maybe because we don't want to be cured!
Thanks for the report. I recently picked up some privy for my ar. I got 1000 rounds of 75 grain bthp match. Have not shot any of it yet but hitting the range this week. Plan on getting some reloading equipment this winter and have some privy brass. Goinng to load some 175 smk's in it and see how I do. Are chronographs expensive? They seem like a good tool of you are trying to dial in your loads.
I did a lot of reading up on chronographs. The ProChrono is the best bang for the buck. Not everybody has a chronograph. I've was never able to find anything on the PPU 168gr Match chronographed by anyone. So, for the price of about 3 boxes of Federal Gold Medal I got a good reliable chronograph and went to the range to find out for myself how this ammo stacked up to the 168gr. Match Ammo Comparison Tests through SniperCentral.
You will need a good chronograph if you plan to reload your ammo.
Last edited by culpeper99; September 26th, 2010 at 09:28 PM.
Thanks for the advice! I will add one to the shopping list when I start collecting reloading equipment. I figure if I start reloading I can get some more range time. From what I gather reading the forum once you find the correct load your accuracy will improve as well. I built my rifles for accuracy so I might as well take the next step and reload.
I've also shot quite a bit of Privi through my AR's and really like the consistency of the ammo. I hadn't seen the 7.62 offering before and am looking forward to trying some out. Is it made to NATO specs? Suitable for gas guns?
Yeah, I've been lusting after a chronograph for years and just haven't got off the dime and bought one. Too busy buying guns and ammo I guess! I do really need on though.
Personally, I don't think any cartridge labeled as .308 Winchester is NATO spec worthy. The commercial .308 case is not as thick as the NATO 7.62x51. People interchange the two rounds all the time but you see more examples of case head separation when using .308 Winchester in a true military weapon chambered for 7.62x51 NATO. As for performance the PPU .308 168gr Match exceeds NATO specifications for the 7.62x51. There are immaterial differences between the .308 Winchester and the 7.62x51 NATO that may become material for the reloader.
Somebody wrote up a nice paper on this subject that is on the Internet, "The Truth About 7.62x51mm NATO and 308 Winchester".
I've done some additional measurements and managed not to kill my chonograph @200 yards. Average fps is 2242. This is the piece of the puzzle needed to conclude that PPU's .446 BC is good out to 1600 fps. Below 1600 fps use .405 BC. You will get 1 MOA out to 800 yards. I've also confirmed that PPU is not using Sierra bullets. PPU manufactures their own bullets; thus, the reason the PPU bullet does not behave like a Sierra bullet. If PPU can get the standard deviation down to 10 fps it will be better than the expensive Federal Gold Medal. Nevertheless, it's own 20 fps is the norm compared to all the rest of the 168gr. Match labelled ammuniton. All BCs above are based on the G1 drag function, which nearly all ballistic software utilizes. You can get almost identical results with G5 using a BC of approx. .286 producing the same time of flight and very close path out to 1000 yards. I don't recommend using G7. It produces a bullet path that appears to be too good to be true between 800-1000 yards.