This is an interesting topic of discussion to say the least. So I might as well throw in my two cents. In so much as we all pretty much know each ML has its own pet load/charge and we all strive for consistency - here's an idea to throw out there and two different ways to approach it:
1. Take the volume measure of your choice and use it to determine your most accurate charge at the range. Then use that volume measure and weigh several charges at home on your scale. Use the average weight, load some tubes up and confirm on the range.
2. Using the appropriate conversion ratio, weight several charges of different weights just as you would load different cases with different charges for a CF and from those determine your most accurate load. When done, use it or see where it comes to on your volume measure for later reference.