Exact charge weights are not needed for best accuracy at long range. A 1/10th grain spread is all that's needed if the right powder's used for the cartridge and bullet weight. I used a cheap, very old, Redding beam scale measuring powder to such a spread shooting long range matches scoring high enough to be classified with the top 2% of all competitors shooting shoulder fired rifles slung up in prone. It's measured my three check weights exactly the same since 1966.
If one measures a 50-grain charge weight to 1/100th grain accuracy, that's .02%. Do they weigh the priming pellet inside the cup that weighs about 1/2 grain to the same tolerance and know how much of the total primer's weight of about 7 grains it is?
Some excellent extruded powders' granules are about 3 or 4 per 1/10th grain; does one cut a granule to a shorter length to make the charge to 1/100th grain repeatability???????
Testing loads for accuracy at 1000 yards, that 1/10th grain spread in charge weight was good enough to shoot 15 and 20 shot test groups as small as or smaller than long range benchrest records. And sometimes with new, virgin brass. (Wish I had been able to shoot them that good in prone.) The most accurate long range rifles (both benchrest and shoulder fired in prone) shoot inside 3/4 MOA at 1000 yards. Once in a great while a single few-shot group out of thousands will be close to an inch or two but all the other groups are much, much larger.
Precise powder charge weights are way down on my "must have" list for best accuracy hardware at long range. Even well made, mass produced commercial match ammo with 3/10ths grain spread in charge weights will shoot 1 MOA at 1000 yards in decent rifles. A lot more important are most of these others:
1. Properly equipped person (has the perseverance, aptitude, skills and knowledge to make stuff shoot accurate)
2. Barrel (uniform bore, groove and twist dimensions, properly chambered)
3. Bullet (well balanced & at least .0003" larger than barrel groove diameter.)
4. Powder (extruded, low fps SD and least fps change per 1/10th grain weight change)
5. Primer (ones properly seated, producing lowest velocity spread)
6. Action (bolt & receiver face squared, doesn't twist loose from epoxy bedding)
7. Firing pin spring (at least factory spec; 10% more is often better)
8. Sight (one that holds zero with heavy recoil; repeatable adjustments)
9. Case gauge (to measure case headspace to set die in press just right)
10. Sizing die (full length, neck honed to .002" less than round's neck diameter)
11. Neck turning tool (promotes a little more uniform case neck grip on bullets)
12. Mechanical beam scale (weighs powder to 1/10 grain, cases to 1/2 grain)
13. Case weight (a 1% spread's good enough but some think half of that's better or even zero)
14. Stock (fits the shooter, holds the barreled action repeatably, doesn't warp)
15. Seating die (most anything will do well if fired cases are properly sized)
16. Bullet runout tool (measures bullet runout at bullet tip relative to case shoulder axis)
17. Powder measure (one that throws stick powder to a 3/10ths grain spread)
PS: If the experts shooting benchrest with small 22 through 30 caliber cases through 300 yards throw charges directly into cases metering to a 2/10ths grain spread and win matches as well as setting records without weighing to individual powder particles, seems to me a 1/100th grain charge spread would be totally invisible on paper.