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A couple of thoughts. Loading the lesser powder charge at a shorter OAL will slightly increase the pressure, so that may contribute to evening out the difference.
Also, I found that H335 was significantly more even in groups and POI across a broader range of powder weights than other powders such as H4895, BLC2 and Varget. So for that specific powder it does not surprise me much. I was testing loads at 100 yds.
Could just be the harmonics on the particular barrel you have, too. It would be interesting to see how groups and POI compare for you on charge weights between 24.0 and .24.9 gr.
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