Originally Posted by vapodog
Originally Posted by Dirtfarmer
257R pressure caps are so conservative compared to its 6mm Rem cousin, I see no problem running a few grains over book max.

DF
.....fully agree with this assessment.

It would be interesting to see lab tested data for the 257R at 60K psi. The 6mm Rem runs at 65K with similar quality brass, same actions.

DF