I worked up some loads with LVR and 123 gr SST's , the velocities i am getting seem high for the charge weight The gun is an AR with a 20" Core15 Barrel I honestly don't know what chamber they use but it is a nitrided 5R 1:8 barrel. All of my loads where loaded to OAL of 2.250, used Federal AR Match primers,new starline brass trimmed to 1.510, and crimped with a Lee factory crimp die and the temp when shooting was 82. I started at 29.0gr and got avg 5 shot velocity of 2479fps with a grp of 1.715", my best load was 29.5gr avg velocity of 2529fps and a grp of .88 at 30.0gr I was getting 2564fps with a 2.10 grp at 30.6 I was at 2577fps with a 1.56 grp and at 30.8gr I was at 2596fps with a 2.1" grp at 31.0 I was at 2613 with a 1.82" grp I didn't see much pressure signs until the last 2 loads when I started getting ejector marks. What I'm seeing is these velocities are 100fps higher than what they should be so I thought my chrono was wrong, I tried 5 shots of Hornady black 123gr ELDs and got an avg of 2477. What do y'all think is causing the higher than expected velocities.
Leverevolution experience?
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Originally posted by jiffylube84 View PostI worked up some loads with LVR and 123 gr SST's , the velocities i am getting seem high for the charge weight The gun is an AR with a 20" Core15 Barrel I honestly don't know what chamber they use but it is a nitrided 5R 1:8 barrel. All of my loads where loaded to OAL of 2.250, used Federal AR Match primers,new starline brass trimmed to 1.510, and crimped with a Lee factory crimp die and the temp when shooting was 82. I started at 29.0gr and got avg 5 shot velocity of 2479fps with a grp of 1.715", my best load was 29.5gr avg velocity of 2529fps and a grp of .88 at 30.0gr I was getting 2564fps with a 2.10 grp at 30.6 I was at 2577fps with a 1.56 grp and at 30.8gr I was at 2596fps with a 2.1" grp at 31.0 I was at 2613 with a 1.82" grp I didn't see much pressure signs until the last 2 loads when I started getting ejector marks. What I'm seeing is these velocities are 100fps higher than what they should be so I thought my chrono was wrong, I tried 5 shots of Hornady black 123gr ELDs and got an avg of 2477. What do y'all think is causing the higher than expected velocities.
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NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
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