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dmmccarter · June 2, 2013, 10:13 PM

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

Chart:

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...

June 2, 2013, 10:13 PM	#49
dmmccarter 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 Chart: 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...