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Old June 2, 2013, 10:13 PM   #49
Junior Member
Join Date: June 2, 2013
Posts: 1
Here is something I posted over at Castboolits...

I have been working on a gas seal load that would replicate the velocity of a Military Surplus Nagant 7.62x38r round for a couple of months and thought I'd share what I found.

Boolit: Lyman 311008 FN 115GR
Case: PPU 7.62mm Nagant
Powder: Trailboss 5.1gr C
Primer: CCI 550
Dies: Lee M1 Carbine (with custom seating), Lee Universal Decapping, Lee Universal Expander (with custom flare die), custom crimp die.

Data: (taken from 10ft from the muzzel)
Test Round: 113 GR Cast Boolit Gas Seal
Hi Vel: 974
Low Vel: 834
Ave Vel: 907
Ext Spread: 140
Std Dev: 36
+1SD: 944
-1SD: 870

Basline: 108 GR Military Surplus Gas Seal Round
Hi Vel: 937
Low Vel: 846
Ave Vel: 900
Ext Spread: 91
Std Dev: 30
+1SD: 931
-1SD: 870


Let me know if you have any questions, if this is useful for you and if you have any feedback.

Here are the dies in order of operation...
decapper, expander, <prepared case>, M1 seating die, custom crimper, M1 sizing die.

Here are three finished rounds and a cast boolit...
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