I have a progressive press, I load for pistol and rife. I found my self reloading for precision. You can get very good ammo out of a progressive press, but not that precise. A powder dump is not as precise as measuring each load yourself. COAL can differ, seating depth will very, not that much but. So it is what you want out of your reloading. If you want a number of rounds similar, and much like factory ammo, and in a lot of cases still better than factory ammo. Or do you want to tinker with the loads, as many, not all, but still many who reload do.

Like Homers Bother, said a chronograph, can be a very useful tool. The way you measure your powder can make a difference in speed. Very slight variations in powder can make just enough variation in speed, to effect area of bullet impact. It all depends on want you want out of your ammo. How deep into reloading do you want to go, what will satisfy you and your needs.