Sierra 107 TMK Load Data

[tstowater]

Finally got out to do some more shooting today with the chronograph. This is a 243 shooting the 107's. See post 136 for the rest of the specs. Chronograph says we are right at 2900 fps and was shooting excellent like the last time. Going to load up some more and run it out to some distance the next time out. No brainer. Not sure what to do with the 95's since the 107's shoot so well.

 

[MCGHeel]

Gonna see what y’all think. Tried to get the 107s to shoot out of 6arc but really struggling with it. Tried Staball match, 8208xbr, cfe223. Best accuracy has been cfe so far. Max mag length is ~0.090 off lands measured with oal gauge. I’ve shot at max mag length and backed up another 0.050” to test. Just not great accuracy. Has shot factory stuff around an inch in the past. Tried 107s 108eldms and 100 interlocks so far. None have wowed me. Pic below is most recent tmk group with shorter oal. Seems it tries to group but then throws em around too. I’m at the point of taking gun/scope apart and remounting/torquing everything just to make sure. Anybody have thoughts on next to try?

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[Nine Banger]

Gonna see what y’all think. Tried to get the 107s to shoot out of 6arc but really struggling with it. Tried Staball match, 8208xbr, cfe223. Best accuracy has been cfe so far. Max mag length is ~0.090 off lands measured with oal gauge. I’ve shot at max mag length and backed up another 0.050” to test. Just not great accuracy. Has shot factory stuff around an inch in the past. Tried 107s 108eldms and 100 interlocks so far. None have wowed me. Pic below is most recent tmk group with shorter oal. Seems it tries to group but then throws em around too. I’m at the point of taking gun/scope apart and remounting/torquing everything just to make sure. Anybody have thoughts on next to try?

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Most rifles shoot 1.5-2 MOA.

 

[Matt5266]

Since your still tinkering with loads , definitely tear it down and check everything just so you have peace of mind and dont chase your tail for nothing.

Is there consistency to those outside shots? Possibly due to mirage off the barrel or can? Parallax set correctly?

Just some thoughts.