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factors
-Chamber size
-Crimp tooling (test a Reding Profile Crimp Die)
-Test WLP and Federal 150 before testing dedicated Magnum primers (but YOUR gun may very well want its 2400-fueled loads ignited by Magnum primers)
-Other gun factors (like gap, bore diameter)
-Better powder choices for 255g/1000-1100fps loads include HS6, N350, and Power Pistol
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