I have had a Oehler 33 for a good many years, and had no problem with it. I set mine for the 4' spacings.

I was on another cite and a fellow stated that after 4000
velocity was reached that they were not that accurate. I asked him why, and did not understand why. He stated that he had talked to Oehler and was told that you need one foot of spacing for every thousand feet of velocity. If this is true, then with a spacing of two feet, then most readings over 2000 feet per second must be incorrect.

I have had no problem with mine reading past 4000 ft per second. What do you think?

Hell, just read the instructions!!

You payed that much money to find out how fast your bullets are going and they don't even include set-up instructions? Another good reason why I prefer Chronys. I'm living proof that they're pretty much idiot proof.