Still an unknown.

Not saying you?re right. Not saying you?re wrong. I?m saying the result of the shot and what you actually hit (internally) is unknown.

Until all aspects are known, one cannot decidedly blame any one entity. It could be shooter. It could be bullet. It could be both.

Unknown.

If switching bullets gives you more confidence. By all means......do so. But without complete facts.............all else is speculation and assumption. Not that those are wrong. But, they are what they are. A speculation and an assumption.
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"To Hell with efficiency, it's performance we want!" - Elmer Keith