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Hi can some body tell me how far muzzel of shot gun from chronograph to test cartriges .please

thats a good question,I would presume you need to know how far the wad travels before the shot is dispersed,plastic and fibre wads will work differently

have you tried "google" hes your friend

 

http://www.claytargettesting.com/study2/Study2.1.pdf

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I've used my Chrony at 6, 9 and 10th feet with both plastic and fibre wads. it sits on an old sleeper with a chunk of wood in front of the box. with 4 bits of thin dowling , and on bright sunny days a bit of white corex for a difuser.

So far no hits, but I guess there may be a first time.

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I've used my Chrony at 6, 9 and 10th feet with both plastic and fibre wads. it sits on an old sleeper with a chunk of wood in front of the box. with 4 bits of thin dowling , and on bright sunny days a bit of white corex for a difuser.

So far no hits, but I guess there may be a first time.

As above, you just need something infront of it to protect it from any low shot,the thing to do is shoot one over the top a little high and move down until you get a reading. 3-4 yds away should be ok,the shot will be more like a solid object at that range,then you should be able to find a calculation on the net to work it back to muzzle velocity.

Edited by Redgum
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It's all over by the time the wad goes through the chrono. It times the first piece of shot over the start sensor, to the stop sensor, then calculates the speed of that piece of shot. 10ft would be a good range, any nearer and the muzzle blast might interfere with the readings. Hope this helps. Andy

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I chrono shotgun loads at about 2-3 feet away and about a foot above. Airguns are much closer.

 

It's only a comparative thing mostly anyway, just use a factory cartridge as a baseline and use a consistent method each time. You might be surprised how much slower than the stated speed factory made shotgun cartridges are.

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I think protecting the screen is a good idea, unless you want to become familiar with the repairs dept of your chronograph maker. I have personally put a Muzzleloader wad through the screen at about 6' from the muzzle. I am assuming (I know, I know) that a shotgun wad would be equally hard on the screen. I had shot 5-6 loads and the bullet path was fine you just can't predict the path a wad will take. A piece of plexi in front would no doubt work and still make the no.s visible.

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