RCBS Chargemaster 1500

[browningautorifle]

I re-zero every 50 rounds or so during an extended loading session

That sounds like a good idea, I had a bit of drift during my session of 200 rds and just tossed them back in.

my Hornady powder drop sucked with stick powders, like varget or 4064.

That's why I scaled for 40 years...no more though. I have a Lyman 55 powder measure. Great for ball but not for conical or extruded,