No, Remington 2 1/2 is Large Pistol Primer (not magnum) that's the primer Hodgdon reloading booklet recommends with their H110 powder for .44 mag pistol load. The only reloading manual between Hodgdon, Nosler, Hornady and Speer to mention other than Large Pistol primers is Speer, which says CCI 300 or 350 with H110 for .44 mag.
I stick with Hodgdon's recommendations, because Remington 2 1/2 consistently fires in my Ruger Redhawk on DA. I had a little problem with another manufacturers primer on this revolver. Since then I've put many hundred of rounds through with consistent performance.
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