TEN rounds at each load level?! That's... excessive... to say the least. 3 is sufficient, 5 is MORE than plenty. 10 is... about 1500gr of wasted powder.
Jumping full grains between loads is not conducive to finding accuracy either. In the range of 50gr charges, load increments should be .5 at most, .3 is better.
3 rounds each at load increments of .3gr would be a much better use of that 1,500gr of powder.
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