Measuring is quick and easy with loose powder. With loose powder, just fill your barrel up almost to the top and seat the bullet with the tip of the bullet sitting just below the crown. JOKE, do not attempt.

Now on a serious note. I've shot both loose and pellet over the years but for the sheer ease of loading as well as clean-up, I switched to 777. IMO the 777 Pellets are not as clean burning as the loose but substantially cleaner than the pyrodex pellets and I've gotten good accuracy. I've always wanted to shoot the loose versus the 777 pellets through a chrono to see if there is a significant velocity difference between the two.