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Old January 10, 2017, 09:11 PM   #1
Bytesniffer
Member
 
Join Date: November 29, 2016
Location: Long island ny
Posts: 67
Using nosler 7.62x51 data as reference.

The 7.62 data shows a volume of
49.5 gr of water
My fire formed 7.62 round
Trimmed to factory length 2.0075
After firing the round
Reads 52.3 grains of
Of water.
Nosler shows a length
Oacl of 2.800 with a 155 grain bullet
Powder charge of 40.5 in
For imr 4064. What Inn using.

If I read the coal of my 7.62 round
It reads 2.784
Bullet is 150 grain. 1.125/6 in long.

If I take my fire formed case
With neck tension on it and take the
Exact bullet that factory ammo is using
150 gr BT 1.125 in lenght and put this bullet
(Dummy round ) load it in my chamber
And close it. I force the bullet
Into the case and bullet ogive hits
My lands .
It reads 2.834.

So I'm using 40 gr of
Imr 4064 150 gr bullet
Coal 2.785

These rounds should be fine
Just like factory spec 7.62
Ammo I have.
Then , I will increase to 2.790
Next time. Then 2.795 that's still
Approx 40 thousandths from ogive
To lands.
See how they perform.
In my rifle case and bullet
Hits the lands at 2.834
I have room to move closer ?
Attached Images
File Type: jpg 762-155.jpg (49.7 KB, 13 views)

Last edited by Bytesniffer; January 11, 2017 at 08:12 AM.
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