The Accurate Reloading Forums
Re: Setting up chronograph

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22 November 2004, 17:24
Kory
Re: Setting up chronograph
Quote:

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.



I know. All of the "big guys" at the range have $300+ Oehlers and I have my $99 Chrony. We tested theirs against mine one day and the difference was literally few feet per second. About the same variation as bullet to bullet! Were they surprised!

Kory
23 November 2004, 01:42
<eldeguello>
The counters that measure the elapsed time between the start and stop screens are all about the same, if not actually identical, on all such devices....
23 November 2004, 01:59
Mike375
Kory

In some locations Cronys will often read very high as in a couple of hundred feet per sec. I assume that under some light conditions a different part of the bullet is triggering each screen.

Mike
23 November 2004, 02:43
<eldeguello>
Quote:

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?



I think the idea of having to have 1' for every 1000 FPS of bullet velocity is a crock. I have nothing at the present time that will break 4000 FPS, so I cannot speak for what is required for such velocities. But I have used my Chrony for velocities into the 3,800's, and got readings in the same vicinity as I get with my Oehler with 6' spacing. The Chrony's spacing is 1'.