@winaa Thanks that's exactly the comment i was after, i will send you a PM cause im still surprised the OAL i got, still i will back it off 5 thou and go from there.
im exceedingly aware of how seat and work out the mechanics around bullet jump etc, hell I've even make sulphur casts of the chamber to better understand the rifle im working on.
i never however thought that they would reduce bearing surface to increase BC dynamics.
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