Bore cleaning witches brew.

I'll need to revisit this topic when the Howa Mini 1500 in 22 ARC shows up. Howa apparently still recommends the old shoot once, clean, shoot once, clean regimen some of us followed 30 years ago.
I followed their barrel break in recommendations for my howa 1500 22-250. Honestly, I didn't see any improvements with accuracy. Same from the first shot to the 50th. Load development and barrel tuning was where my accuracy showed up.
 
I've seen other comments to that effect regarding Howa break-in. I was taught to use Sweet's 7.62 then Kroil, then shoot, then repeat by a guy who was an outstanding light varmint class shooter. I was never certain it helped all the much, but I figured it couldn't hurt.
 
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