.308 Winchester

Some very early testing with a new 18.5" build with 210 Sierra Matchkings and N550. Both 5 shot groups.

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I did that with 200.20x’s but used Winchester commercial brass and got pressure signs at 2650 from a 24” barrel. Accuracy came in at 2580 and was very usable until the temp dropped in the 30’s and I accepted that a 12” twist is not enough for this projectile.
 
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