I also reloaded for a number of years before buying a chrono, I relied on my Speer charts, seemed to work just fine. As long as you determine where your bullets zero at various distances and watch your brass for pressure signs, you can easily get by without one.
But I have used one now for about 20 yrs. and it does help make my life a bit easier, actually simpler would be the correct analogy. I did get spoiled fast though cause now you can determine trajectories much quicker than the old fashioned way of shoot @ 200 yds., then @ 300 yds., so on, so forth. I was just taking the average fps and calculating the drop using a ballistic chart. But I haven't even had to do that since getting a Leupold RX-IV R.F. with the TBR program. I set it on the program that corresponds to the specifics of the bullets B.C., and velocity, and it provides me with the MOA +/- compensation on the elevation turret, it also compensates angle. I've had the TBR RF for about 3 or 4 yrs. now and it is very reliable.
GS