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What kind of scale are you using to get that .1 accuracy?
With a +/-.1 gr accuracy as noted with this type of scale, isn’t it an exercise in futility changing loads only by .1 grain. I mean as the advertised accuracy states you could be trying to weigh in .1 increments but in fact the load could be .2 gr or .15 or .17 gr. Just my observation. I think your .2 gr increments will suffice for what you are trying to achieve. I believe you are working with a factory gun also.
An ES of 127? What was you ES from the previous groups? I’ve never seen one that great for the same charge weight