I use an RCBS Chargemaster. If I do my part in terms of what RCBS recommends, I have no issue charging loads to optimal accuracy. I power up my unit a half hour before using it to let the electronics warm up. It is set up level. there are no unwanted air flow across it, I calibrate every time. I do keep an RCBS balance scale to verify it, it hasn't lied to me yet. I have no issues using it for precision loading. I have made modifications to the charging programming depending on whether I use a ball powder vs an extruded powder. And I do use the McDonald straw as well.
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