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Posted: 9/12/2004 9:05:59 PM EDT
| Has anyone come up with a sub sonic load for the 6.8 SPC ? It sure would be nice to use my can on my 6.8 SPR. |
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I have never done any testing of subsonic loads with jacketed bullets. I am currently using 3 grains of Bullseye behind a .313 dia 100 grain cast flat point bullet or a .314 90 grain swaged semi wadcutter made by Hornady. I shoot these in my Mosin-Nagant 91/30. They come out at about 1000 fps, the 100 grain a little slower at 980 fps or so. Velocity spread for 5 shots is usually less than 20, sometimes around 15. I have also used VV 310 at 3 grains, but the powder position is more crictical, but when you always put in at the rear, velocity spread is equal to bullseye. Noise level is low. Hard to compare to anything. Louder than 22 subsonic. Maybe the noise level is about equal to 22 high velocity, but it doesn't have the crack so, it isn't really comparable. From what I have read, with 150 grain bullet in the 7.62x54R start out with 8 grains VV 310 and work down. Max load is around 15 grains with the same load. 8 grains is a good, safe starting load. If using jacketed, I have read to use Sierra. Their jackets have a more consistent friction than almost anyone else. I would imagine that you could definately start out at 7 grains of fast pistol powder and probably 6. Start higher and work your way down. I would not want to use jacketed bullets. Use moly if you can. YMMV Just what I hear. |
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