Looking at your target again, I see another node, 11, 12, 13. So load up five each of those also.
What you are looking for is as you go up in powder charge, the elevation will climb quickly, then there will be a leveling off for three or four shots, then climb again and level off, etc. Usually there is three of these "nodes". You then try to find which one is the best by shooting a group in each of these. The one thats the best will be the "sweet spot" for that barrel. When you change anything it wont be the same, like a different bullet, or powder lot.
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