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Hard primers aren't unusual, they do reveal that you weren't working with much margin on the "soft" primers.
Could be debris in the firing pin channel. - Dis-assemble and clean.
Since you have it apart, chamfer the breech side of the firing pin hole (turn drill bit a few sizes bigger than the hole by hand), polish the outer surface of the firing pin (do not sharpen), run a drill bit in and out of the firing pin hole by hand to deburr it. Re-clean, re-assemble.
GL
Could be debris in the firing pin channel. - Dis-assemble and clean.
Since you have it apart, chamfer the breech side of the firing pin hole (turn drill bit a few sizes bigger than the hole by hand), polish the outer surface of the firing pin (do not sharpen), run a drill bit in and out of the firing pin hole by hand to deburr it. Re-clean, re-assemble.
GL
