I'm not familiar with Red Dot, but some bulky powders will "bridge" in the powder drop tube, and leave a case mostly empty, but the next case usually gets a "extra" charge. That's the reason for the "Stop and eyeball every single case in the loading block" before setting any bullets in. Brain fade happens to all of us, that's why we must develop good procedures, to catch our brain fades.

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H Richard
SWCA1967 SWHF244