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Sierra JSP's

With my L5 .50AE 400gn reloads a maximum case fill of H110 and an OAL of 1,595 only gets me 1040fps. Hovering around 42,000psi, is there a better powder to get the velocity higher?
Or should I be...

I picked up my factory new L5 at the LGS, I was first to open the case and inspect it. I walked back to the range to take a shot for a "fired brass volume' case for reloading.
No slide hold open....