PPU matchline ammo 7.62x54

[OKBPS]

Pulled apart some PPU Matchline ammo. Don't know if you are interested but here is what I found. I posted 2 SR 21 targets, one on top of the other, and had to hold 6 O'clock on the bottom target to hit the top target at 100yds. Group was 3.57. Standard Ammo grouped 4.15, only other stat is FPS. First time shooting a M91 that I just got. Going to pull the rest of the bullets and work on a better load that was given to me. Too much recoil for me. Bullet diameter was .308 but .311 at the base. If you are shooting PPU matchline maybe this be of some use to you.

PPU Matchline
Case weight
154.9
154.9
155.7
155.9
156
156.1
156.2
156.2
156.3
156.7

Bullet weight
182
182.1
182.2
182.2
182.4
182.5
182.6
182.9
182.9
183

Case length
2.0995
2.0995
2.1000
2.1000
2.1005
2.1015
2.1025
2.1030
2.1035
2.1035

Powder Grains, I spilled one.
49
49
49.2
49.2
49.2
49.3
49.3
49.5
49.5

FPS
2635
2649
2654
2654
2659
2663
2684
2692
2697
2698

PPU Standard
FPS
2646
2656
2659
2666
2674
2682
2692
2692
2773
2791

 

[dlbleak]

Gonna need a file for that front sight assuming you have the rear sight bottomed out.

 

[OKBPS]

I will know for certain after I try the recipe you gave me. I actually have 2 different bullets to try. .308 Sierra matchking 168, and .308 Sierra Prohunter 180.

 

[dlbleak]

The reduced load might land them right in place.

 

[swampratt]

Nice that you posted all those numbers..Takes some doing to get ammo apart and measure all that.

A couple more measurement i found very useful is Neck ID and Neck OD.
I found if the ID is off .0005 on pulled rounds that that round will likely open the group.

Neck surface texture on the inside is also something I found makes a huge accuracy difference.
I had some crummy shooting .308 ammo all measurements were close one case had .0005" difference in ID ..I also noticed the powder looked like BLC-2 and 150gr bullets..In my testing 45.0gr was an accuracy node.
This stuff was over that ..I reduced the load to 45 and put them back together.
Tight grouping ammo after that.

When i was pulling various .223 and .556 ammo i found out of the same box some would let go of the bullet in a couple wacks of the inertia puller.
And some even after 15-20 wacks would not come apart.
That will not result in accurate ammo.

 

[dlbleak]

Nice that you posted all those numbers..Takes some doing to get ammo apart and measure all that.

A couple more measurement i found very useful is Neck ID and Neck OD.
I found if the ID is off .0005 on pulled rounds that that round will likely open the group.

Neck surface texture on the inside is also something I found makes a huge accuracy difference.
I had some crummy shooting .308 ammo all measurements were close one case had .0005" difference in ID ..I also noticed the powder looked like BLC-2 and 150gr bullets..In my testing 45.0gr was an accuracy node.
This stuff was over that ..I reduced the load to 45 and put them back together.
Tight grouping ammo after that.

When i was pulling various .223 and .556 ammo i found out of the same box some would let go of the bullet in a couple wacks of the inertia puller.
And some even after 15-20 wacks would not come apart.
That will not result in accurate ammo.

SR, are you ‘sanding the inside of the necks or just a stiff bristle brush?

 

[swampratt]

I was using a bore brush (Nylon) with 0000 steel wool wrapped around it for some time and found just a bit oversized nylon bore brush did just as well.

If you have dial calipers that will fit inside the case necks you can measure the ID at the same time turning the case slowly with your other hand.
You can feel the roughness or smoothness of the inside of the case neck.

Now brush it with a spinning bore brush and measure and feel the surface again.
You may see a big difference.

 

[dlbleak]

Thanks, I’ll give it a go

 

[OKBPS]

A couple more measurement i found very useful is Neck ID and Neck OD.
I found if the ID is off .0005 on pulled rounds that that round will likely open the group.

I already resized and chamfered the pulled cases to reload them but the ID is pretty consistent at .3055 and the OD is .3255 to .326. Neck thickness is steady at .011 to .0115 so that math doesn't quit work. I will use the factory bullets to see what difference I get if any by using the recipe that I plan on shooting. I did not measure when I pulled the bullets but have more I can do later. The standard ammo cases I fired will be used to create a load to shoot competition with my bullets. I plan to chamfer only the first time, I always brush the necks, and then add one other step each time to see what it does to my group. I will use the steel wool as well just because that makes sense to me and I could feel the roughness on the inside.

Still learning a lot of this so I appreciate the tips.

 

[Dumpstick]

Just pull the bullets and drop the powder charge 10%.
Reassemble.

The muzzle blast will lessen dramatically, and you will notice the difference in kick also.

I suggest 44 grain charge of factory powder.

I've done this several times with other brands and cartridges, I have never been disappointed.