I went away from the CCI-450 for misfires. Have heard many other reports of the 450s doing it pretty often. Not what you want. I ended up going to the federal 205s and have had no issues yet. They may well be softer in construction but they haven't failed or blown/shown pressure any sooner.
But as above, it could well be a firing pin problem? When did you last strip the bolt down for a good deep clean?
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