If you want to meter extruded powders with uniformity and without shearing grains, forget the Harrels. Go to the store,or online), and buy a Lee Perfect Powder Measure.
The Lee is cheap,about 1/10 the price of a high end measure), and at first glance, it's a joke,all plastic). And in several independent tests, it works as well or better than any powder measure under $500,i.e., throws to within 0.2 grains). For most purposes, 0.2 grains isn't going to make that great of a difference.,One account says that at near-max loadings, a 1 grain charge weight variation in a .308 case is worth about 60 FPS.)
If that 0.2 grain variation really matters to you, then start weighing each charge. If you go down this road, you'd better have a balance that can read to 0.05 grains or better. Why? If your balance's uncertainty is +/- 0.1 grains,i.e., most balances sold for reloading), you inherently have up to a 0.2 grain spread. Balances reading to 0.05 grains or better usually aren't cheap - they start around $200, and go up from there.
There is a down side to a Lee Perfect Powder Measure - ball powder flows through one about like $*it through a goose. Due to this behavior, the Lee doesn't meter ball powders very uniformly. Then again, other measures will generally meter ball powders pretty well.
Midway USA has the Lee Perfect Powder Measure on their site at http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=540522