Originally Posted By: 6724i see many guys posting on here about their pet loads and often the velocities are far higher than what i get. it makes me wonder if these "home owner" type chronographs are accurate and consistent.
it makes me wonder if my chronograph reads low, is there a way to check it?
also, i load for max accuracy not max velocity. i rarely find great accuracy with at or near maximum loads. my accurate load in my 24" barreled ar15 with a 55gr v-max is 25.5gr of 748. according to my chronograph, it is running 3050fps. it groups, in cold weather, around 1/2" sometimes much less. but then i hear of people running the same bullet out of a 4" shorter barrel at 3300fps, are people running bullets that fast getting superb accuracy?
my chronograph is a shooting chrony f1.
There are a few things that no one questions in shooting. One them is their chronograph. People swear that if it says they are getting a 12 SD then that is what they have...
... some years ago, a friend and I lined up 4 chronographs in a row, and shot through them.
You would expect that they would be the same, less a few feet per second because of velocity loss between the individual sets of traps.
No way, Fuzzy José.. they were all over the place, including two Oehlers... which didn't match by ~100 fps.
And the errors were not consistent - one would be higher on one string and lower on the very next string. - one would have a 25 fps difference on one string, and 45 fps difference on the next.
I called Ken Ohler and asked if there was a way to check calibration, and after a 45 minute discussion, we agreed that there was no way to check anything, without a humongous amount of laboratory equipment.
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