I use a .223 Wylde chamber in my Shilen Select Match barrel with 80gr Berger VLD's. I'm also using the same powder charge...24.5 Varget at 3020 fps. FWIW, the SMK 80's shot equally as well as the Bergers, but the Berger VLD design had to be seated way further out to reach the lands.
My measurements are of no use to you....in YOUR barrel....with a different bullet.
But here it is:
24.5 Var Berger 80 CBTO: 2.065" group size .180" FPS: 3020 Chamber measures: 2.083" (with Berger 80 VLD)
For some odd reason that .018" jump gets me those tiny groups.
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