Re: Gempro 250 versus RCBS Chargemaster....
They are not even comparable. Not only does the Gempro have 5x more resolution, it will hold zero much better and float less.
The chargemaster will straight up lie to you. It will float to its zero, and it will float to its desired charge weight. The scale on it is crap. Scales of the same quality sell for $25 on amazon and ebay all day long when they are not labeled RCBS gunpowder scales.
Don't get me wrong, the Gempro is certainly no lab-grade balance, but you will spend close to $1000 for one of those and you may have a hard time justifying the cost of that. My A&D balance has the same resolution as my Gempro, but it is more consistent and floats less. It is also about 14 inches square and weighs nearly 6 lbs with a 5" weighing pan that doesn't care where you put the weight. In fast mode you can watch the display and see a kernal of 4350 hit the pan as opposed to waiting for the scale to refresh every .5 to 1 seconds.