Don't get hung up on the chronograph. Spend more time finding accurate loads...................then chronograph them. Never started separating 9 mm brass, till I got a carbine. Now, I separate for accuracy/consistency reasons. Never had to check brass length, let alone trim. Been reloading the 9 mm, since the mid 70's. Learned by reading and trial and error. There wasn't any internet.
The second cartridge I learned to reload, was 9 mm. First, was 38/357 magnum. I've loaded a whole host of different headstamps. Very few I won't reload. S&B is frowned on, on the other forum. I have no issues with it and have reloaded the same brass up to 15 times, before scrapping. I shoot more 9 mm than any other cartridge...............I own a half dozen of them. All are semiautomatics, therefore hungry, all the time. Never chronographed a single load. I have access to a Shooting crony and Lab Radar. I let the gun and target speak.