You figured that out fairly quick. Every barrel I've ever worked with had to be fouled before it was consistent. This is normal.
If you think about it, the barrel condition changes after every shot until it reaches a point of being consistent. Your 2nd shot will never be the same as the 1st, etc, etc.
I don't clean my target rifles until accuracy starts to go away, usually about 200 rounds +/-.
When working up a new load, always shoot some "foulers" before you begin. If I clean my target rifles, I always shoot a few....or 5, before the next match.
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