Thread: 257R Experiences

Originally Posted by tetawa

loaded up using R-P new brass, numerous misfires with poor primer strike, no problem with Norma ex 7x57 cases, checking brass the R-P has a much wider extractor groove, remember many moons ago having or hearing about a similar problem with 257 brass but can't remember exactly.

Did you seat well out to get bullet jam for fireforming? This really helps eliminate light strike issue.

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Originally Posted by Mathias

Did you seat well out to get bullet jam for fireforming? This really helps eliminate light strike issue.

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Yes, 117 RN way out to get jam. Barely marking the cases, with ex Norma 7x57 great strike. same primers. Have primed and fired both with m't brass, no problems with the ex 7x57. Will put up photo tomorrow showing the difference in extractor grooves.

Originally Posted by tetawa

Yes, 117 RN way out to get jam. Barely marking the cases, with ex Norma 7x57 great strike. same primers. Have primed and fired both with m't brass, no problems with the ex 7x57. Will put up photo tomorrow showing the difference in extractor grooves.

I had a similar problem with my 260 improved and found if I gently closed the action on the round rather than normal speed, I had a higher success rate. Shutting too fast pushed the projectile into case & I got less headspace jam & a weak strike


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