I've always tried to ensure that any experiment I do has variables controlled - the condition of the barrel (temperature) has always been on my mind when doing something like this.
Do you start your testing using a cold barrel? What is the effect of a barrel on it's accuracy as it gets hotter and hotter? do you let it cool down periodically?
Just curious if that's a concern or issue or does it not matter as much as I think it does.
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