Author Topic: Chronographing shotgun loads (Read 758 times)

White Flyer · « **on:** May 18, 2005, 04:01:53 PM »

Can anyone give me advice on the correct proceedure of chronoing shotshells, I have a Pro-Chrono but lost the instruction book.
What is the best distance from muzzle to chrono, and any other info would be appreciated.
Cheers WF.

.45 COLT · « **Reply #1 on:** May 19, 2005, 01:40:07 AM »

The way I do it with my ProChrono is: Chronograph resting on a bench, 2X4 in front of it. I do it on a day (light cloud, not full sun) when I don't need the diffusers or their rods. I don't want anything hitting them. About 6 feet from the muzzle. That close, once in a while I get a bum reading, not often.

White Flyer · « **Reply #2 on:** May 20, 2005, 09:15:05 PM »

Thanks .45 Colt, I've chronographed many pistol loads before but I wanted to check on doing shotguns, without instructions I might get some bad readings from having the chrono to close or to far from the chrono.
Anyway I went out today and tried and was pleased with the results(my 10 shots only varied about 45fps from highest to lowest) and suprisingly just for interest I chronoed some factory loads and they varied over 140fps, so I must be doing something right.
Cheers Mate
WF

ruger4570 · « **Reply #3 on:** June 10, 2005, 12:18:05 PM »

I am careful to keep my chrono below the top of the bench,, I hate shooting holes in my Chrono. I have had a couple of really weird readings on occasion. I think it is the chrono reading the shot and then the wad. I had a reading of over 2000fps once and another read something like 750 +/-. I just ignore them because they are too far out to be valid.