Without a ballistic calculator, I would say you're going to have around 10 inches of drop.
As for consistency, if loose powder make sure you measure the same every time (ie tapping the measure, etc). Aligning the petals might be useful, I've never done a test though. Don't worry about snapping caps, a semi-moist spit patch will not leave much residue since you flip it over and run the dry side before loading.