Well, the board is either fixed, or it's going to run terribly. Cross your fingers and hope for the best. I'm at my technical limit right now.

A look inside: 50's Yugo 8x57mm

Post Reply
Message
Author
User avatar
Zeliard
Member
Member
Posts: 217
Joined: Sat Jun 03, 2017 10:27 pm
Age: 40
Location: Southeast US
United States of America

A look inside: 50's Yugo 8x57mm

#1 Post by Zeliard » Sun Jun 11, 2017 7:55 pm

Originally posted by Carteach0.

Image

I picked up another 600 rounds of 1950 vintage Yugoslavian 8x57. While driving along
I was doing math in my head (yes, my head hurt a lot) and figured I had bought
the ammo for about half what it would cost me to buy the components to load my own.

I decided to pull some down into it's bits and pieces.

Drat..... that started me thinking some more. A few weeks back I shot a high power
match with this stuff and did Ok. Hmm..... I wonder how good this stuff is?

I decided to pull some down.... and check it out.

Image

Using my RCBS collet buller puller I gently pulled apart 15 rounds from one box. That
would imply they are probably from the same lot at least. The bullets appear reusable
even though slightly scratched. Perhaps a run through my tumbler might clean them
up cosmetically.

Image

The powder is interesting and I wish I had more details on it. It appears to be a square
cut flake, rather heavy in weight for it's size. I expect it will meter well. Quality appears
to be decent with no degradation from age that I can see. Smell (an important tell tale)
is clean and clear.

Image


Ok.... now to the numbers!

15 cartridges pulled down.... I weighed cases, powder, and bullets from each. I also
measured bullet diameter on the bullets.

Weighing was done with an RCBS 10-10 beam scale. Bullet diameter measuement was
done with a Mitutoyo 0-1 digital micrometer.

All weights were evenly spread across the sample with no noticable bunching
or stand out numbers.

Cases: Clean and solid externally. I plan on sectioning at least five when time permits.
Case weights: High- 118.9 grains, Low- 113.0 grains. Spread- 5.9 grains

Bullets: Full metal jacket boat tail with exposed lead in an indented base. They have a canalure
which is fully covered in the case neck. The case is not crimped into the canalure.
Bullet weights: High- 199.5 grains, Low- 196.6 grains, Spread- 2.9 grains
Bullet diameters: High- .3239", Low- .3233", Spread- .0006"

Powder weights: High- 46.4 grains, Low- 44.7 grains, Spread- 2.3 grains

My conclusions? I have none at this time other than what the data shows.
There is a significant spread in every factor. While none appear to be a serious
safety issue, clearly this ammunition can't be expected to be highly accurate.
In loading precision ammunition expected to shoot within .5" or less at 100 yards,
I hold both bullet and powder weights to within less than 0.10 grains. Cases are
segragated by weight and lot, holding weights within a grain of each other.

This was an interesting hour spent looking at 35 year old military ammunition.
I'd like to do the same with some modern commercial ammunition, and probably
will when time permits. I think I'll also try re-assembling this ammunition with
better control of powder and bullet weight, just to see what happens.

Image
Proud alumni of Transylvanian Polygnostic University. "Know enough to be afraid."

"Vertroue in God en die Mauser".-Faith in God and the Mauser.

"Send lawyers, guns and money." -Warren Zevon

Post Reply

Return to “General Ammunition”

Who is online

Users browsing this forum: No registered users and 2 guests