#1
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17 Fireball and ladder test and my kids science project
I have been tasked with helping my daughter with her grade 8 science project. Her teacher has suggested doing something with firearms and reloading.
We have discussed doing a ladder test with the 17 Fireball that I just had built. My issue here is I have never done a ladder test. I usually just throw a few loads together and start shooting groups. I have a few questions. Can I do this experiment without a lead sled? How far should I shoot the ladder test at? I am thinking 200 yards? 100 might not allow me to see the nodes clear enough? Should I use increments of .1 or .2 grains? I can’t think of anything else right now but these are the basics I have questions to. Thanks. Last edited by albertacoyotecaller; 02-15-2019 at 07:03 PM. |
#2
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17 Fireball and ladder test
I normally start at 100 yrds, with about 6 loads from start to max in .5 differences.
Then when I find a couple that seem best, I then do at least 6 loads with .2 difference. Then when I have at least two that are best, I try some with .1 difference and also might tweek the bullet depth and distance from lands. When I finally have a load that is working best, then I give them a go at other distance and see if they are holding true. Just my way. Bill K I came back for one added comment. Lead Sled ? I know they help tame recoil and all, but a person should really learn to shoot over and on items he/she will use in the real shooting situations. Just my thought, never wanted a lead sled. Last edited by Bill K; 02-12-2019 at 03:56 PM. |
#3
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Um, Lead Sled?
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#4
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The less the outside variables you have such as wind the better, and the 100yd range will be less effected by wind. With anything .204 and smaller capacity, I use .2 grain increments. I only shoot 3 shot groups "for the ladder test", then 5 shots when I compare the best nodes and usually there are only 1-2 5 shot groups shot.
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#5
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Lead sled just to take the variable of the shooter out of the equation. For “scientific” purposes really.
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#6
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The lead sled dose not stop the wind from blowing. I heard it does not blow in Canada, so you might be OK.
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#7
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Lead Sled or not, it's up to you. I understand that you are trying to minimize the variables. My preference, for me, is a good front rest and rear bag from the bench. For the FB loads I would do .2 grain increments, three shots each on a calm day. I would not change anything other than the charge. Once you have settled on a particular charge, then tinker with seating depth. Only change ONE thing at a time. That way there is no confusion as to what caused the group to change. Neat that she goes to a school that is open to such a project!
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#8
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The teacher asked her to do something with firearms. I am not sure how far she will be able to go with it even if it’s a good science experiment. I am sure someone will take offence to it shortly down the road.
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#9
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lead sled actually is a good idea. you really take things down to a mechanical level and remove that thing called flinch or bad trigger pull.
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#10
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that was my first thought too when I first read it. back in the day before my friend John Hinnant retired from teaching industrial arts they actually built rifles in his class. even though he was in Texas I don't think he would be able to do it today. that said shooting and reloading are science.
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