pest hunter 151 15 Posted February 11, 2011 Report Share Posted February 11, 2011 Any one know the rough ftlb of a .410 3inch cart of 19g 4s. Just interested. Thanks PH1 Quote Link to post
matt_hooks 188 Posted February 11, 2011 Report Share Posted February 11, 2011 Total muzzle energy? 19 grams is about 293 grains. Muzzle velocity for a 3" .410 cartridge is around 1100 fps. So, using our trusty formula... ME=(mass x velocity x velocity)/450240 where mass is in grains and velocity is in fps therefore, for a .410 firing 19 grams... ME=(293 x 1100 x 1100)/450240 ME=354530000/450240 ME=787 ft.lb Now, assuming a UK number 4 shot, we will see about 170 pellets per ounce. 19 grams is .670 oz. So 19 grams of number 4 shot will contain about 114 shot, each weighing about 2.6 grains. So, assuming similar velocity for each shot, each pellet will leave the muzzle at a velocity of 1100fps, with a kinetic energy of (2.6 x 1100 x 1100)/450240, or just under 7 ft.lb. I think that's all correct, but it IS late, and I HAVE been at the home made cider so could be wrong! Quote Link to post
RicW 67 Posted February 12, 2011 Report Share Posted February 12, 2011 You could also google "muzzle energy", go to Airhog and put the figures into the magic box . . . Mind,I've been on the Owd Rosie. 8.7% 1 Quote Link to post
matt_hooks 188 Posted February 12, 2011 Report Share Posted February 12, 2011 (edited) You could also google "muzzle energy", go to Airhog and put the figures into the magic box . . . Mind,I've been on the Owd Rosie. 8.7% Meh, quicker and more fun to do the calcs yourself! 8.7%? This home brew I've got here shows nearly 17.5% on the hygrometer, you could run a car off this stuff! Edited February 12, 2011 by matt_hooks Quote Link to post
pest hunter 151 15 Posted February 13, 2011 Author Report Share Posted February 13, 2011 Only 7 ftlb! wow that very low for a shoty. Quote Link to post
matt_hooks 188 Posted February 13, 2011 Report Share Posted February 13, 2011 Only 7 ftlb! wow that very low for a shoty. Not really. You've got to think, an individual pellet only needs about 2 ft.lb to reliably pierce a rabbits skull, far less for a bird. You will probably have several shot hitting the animal, so the total energy delivery is much higher. Quote Link to post
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