You shouldnt be hearing anything but a bang...
H414 seems a little fast for a magnum cartridge and only 65gr of powder combined with standard primers may not be a good combination? I just dont know for sure but wonder if anyone else has tried that combo. What bullet weight are you using with that powder?
If you can hear the firing pin strike, something isnt right and it may be unsafe, be careful and lets see what others say.
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