It could be, but there are more variables that need to be considered.

1. Wind and mirage

2. What weight bullets were you using

3. Did you use a rest or off hand

4. Did you have different powders loaded in some of the rounds or did you use different bullets?

5. Did you grab the trigger in a different way possibly.

That is just a few items that I can think of. Their is mechanical issues that can arise also. Dirty barrel form carbon or copper fouling.

I'm sure I may have missed something covered others. Just my insight,

Respectfully
Mike


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