rubyred Posted January 1, 2012 Report Share Posted January 1, 2012 Hi can some body tell me how far muzzel of shot gun from chronograph to test cartriges .please Quote Link to comment Share on other sites More sharing options...
Ackley Posted January 1, 2012 Report Share Posted January 1, 2012 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 Quote Link to comment Share on other sites More sharing options...
rubyred Posted January 1, 2012 Author Report Share Posted January 1, 2012 Thanks mate will try Quote Link to comment Share on other sites More sharing options...
seeker Posted January 1, 2012 Report Share Posted January 1, 2012 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. Quote Link to comment Share on other sites More sharing options...
Redgum Posted January 1, 2012 Report Share Posted January 1, 2012 (edited) 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 January 1, 2012 by Redgum Quote Link to comment Share on other sites More sharing options...
Doggone Posted January 1, 2012 Report Share Posted January 1, 2012 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 Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted January 1, 2012 Report Share Posted January 1, 2012 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. Quote Link to comment Share on other sites More sharing options...
seeker Posted January 1, 2012 Report Share Posted January 1, 2012 as Sits in H's says .. tho I prefer 9 feet because it lined up with the tables used in the Lyman Handbook ... Quote Link to comment Share on other sites More sharing options...
coyotemaster Posted January 4, 2012 Report Share Posted January 4, 2012 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. Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted January 4, 2012 Report Share Posted January 4, 2012 i think the cip agreed on 2.5m from muzzel. its then calculated back to MV Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted January 4, 2012 Report Share Posted January 4, 2012 i think the cip agreed on 2.5m from muzzel. its then calculated back to MV Mine are tested at 2.5m from the muzzle and pressure-tested at the same time. Quote Link to comment Share on other sites More sharing options...
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