 |  | | | |  | |  |  | Next step for the Hayabusa |  | |  |  | |
 Posted: Sat Nov 16, 2013 5:06 pm |
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| rsterne |
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Just to put this information into this thread.... I posted this a while back....
Over this winter I plan to continue with the development of my Hayabusa project gun by building a .457 rifle and a .410 shotgun version.... It is my hope for them to share a common valve, main tube and hammer, and a 500cc 250 bar (3625 psi) tank.... They will, of course, have different breeches.... Here is the ammo for the .410....
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The shell has been shortened from 2.5" to 1.75" and the primer hole drilled out to 3/8".... The shot cup holds 223 grains of #7.5 shot (0.51 oz) full to the top (about 180 pellets).... My target velocity is 950 fps, but that works out to 450 FPE, which even with 3600 psi may be a stretch....
Bob |
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Last edited by rsterne on Sat Feb 08, 2014 10:18 pm; edited 1 time in total
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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Sat Nov 16, 2013 9:43 pm |
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| robert w |
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,crosman 400,gamo big cat in .22, diana 5g,diana 54 air king, diana 34 in .22 diana 34 in .177, wilrauch hw-55,and a romainian pioner training rifle , and a huge collection of powder burners 35 last count . 1 would think i have a gun store |
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| Posted: Sun Nov 17, 2013 2:07 pm |
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| rsterne |
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An interesting thought came to me today when I was thinking about how to Chrony the shotshell loads without hittting my Chrony.... I had some OOO Buckshot which measure about 0.36", and found out that they are a perfect fit inside the shotcup.... it still loads normally into the shell....
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They weigh just under 70 gr. each, so the total, is only 5% less than a 1/2 oz. of birdshot.... Just out of curiosity I also tried a .357" bullet and it also nestles nicely in the shotcup.... so if I want to have only a single projectile for Chronying I could get some 220 gr. bullets as an alternative.... However, I would think the dispersion on just three roundballs would be so slight that the chance of hitting my Chrony would be no worse than usual within 10' or so, and that should get it away from the muzzle blast no problem....
Incidently, the retained energy of EACH roundball is 120 FPE at 30 yards starting from 950 fps at the muzzle if I can push them that fast.... Three of them would make a heck of a mess of whatever they hit....
Bob |
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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Sun Nov 17, 2013 3:43 pm |
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| lampy |
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Three of them would make a heck of a mess of whatever they hit....
Cue maniacal laughter....  |
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Too many projects to list. |
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| Posted: Sun Nov 17, 2013 6:36 pm |
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| Slavia |
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| Maybe Softchrono and your PC would be an alternative to making "a heck of a mess" out of your light-gated chronograph. |
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 ¡Listo! ¡Apunte! ¡Fuego! |
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| | | | | | | | | Next step for the Hayabusa | | | | | |
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