tag:blogger.com,1999:blog-4146148016062694502.post3290600536804264669..comments2024-01-05T12:03:52.460-05:00Comments on No Lawyers - Only Guns and Money: My Response To The ATF FrameworkJohn Richardsonhttp://www.blogger.com/profile/03151468462458613615noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-4146148016062694502.post-29313697714737936322015-03-18T08:32:47.188-04:002015-03-18T08:32:47.188-04:00@Denton: You are probably correct on that. That pa...@Denton: You are probably correct on that. That part was something I lifted from another letter.<br /><br />Let me say up front that I'm not a physicist but I do remember the basic equation from class. F = MA where F is force, M is mass, and A is acceleration. The force with which a bullet hits an object is dependent upon both its mass and acceleration (velocity squared). It takes a combination of both M and A.<br /><br />From what "Doc Wesson" has said on The Gun Nation podcast, the shape of the bullet has something to do with it as well. "Doc" is a PhD polymer chemist creating and testing fibers that will be woven into body armor. His research has shown that a spire point bullet or spitzer is more likely to penetrate woven body armor as it pushes the fibers apart. I would add that concentrating the force on a very small point helps.John Richardsonhttps://www.blogger.com/profile/03151468462458613615noreply@blogger.comtag:blogger.com,1999:blog-4146148016062694502.post-6279019175714538492015-03-16T22:19:16.624-04:002015-03-16T22:19:16.624-04:00Very nicely done. Good work!
I believe that ther...Very nicely done. Good work!<br /><br />I believe that there is an error in your letter, though. The core of an armor piercing projectile does not have to be made from just one material on the forbidden list. It can be made from a combination of forbidden materials. However, lead is not on the forbidden materials list, so a combination of lead and steel is not forbidden. Your conclusion was correct.<br /><br />There is an interesting NATO slide presentation at http://www.dtic.mil/ndia/2010armament/WednesdayLandmarkBPerArvidsson.pdf. The author is very familiar with the development of the SS109/M855. In slide 10, he says: There were no requirements to penetrate body armor. He repeats the same statement in a 2012 article in Small Arms Defense Journal. The M855 was not designed to penetrate body armor. The extra penetration discussed seems mostly concerned with penetration in flesh<br /><br />Under maximum velocity conditions, M855 will NOT penetrate AR500 body armor steel plate, Brinnell Hardness 500. However, at the same speed, common garden variety lead core 55 grain bullets WILL. The difference seems to be in the fact that M855 is a 62 grain bullet, which is isn’t as fast as 55 grain bullets like the M193. See the video at https://www.youtube.com/watch?v=oMYkEMhPsO8.<br /><br />Back in the 1940s, P.O. Ackley demonstrated that a factory loaded, copper jacketed, lead core 220 Swift bullet will penetrate a ½” armor plate from the front of a US military half-track.<br /><br />The point is that the M855 presents absolutely no extraordinary hazard to police officers or anyone else. Ordinary rifle cartridges of almost all types, fired from a rifle or a handgun will penetrate police armor up to Level IIIA. There is nothing special about the M855.<br />Dentonhttps://www.blogger.com/profile/03156206873116750611noreply@blogger.comtag:blogger.com,1999:blog-4146148016062694502.post-84420114316012310542015-03-16T16:27:12.182-04:002015-03-16T16:27:12.182-04:00Nicely done sir! And one hopes it actually gets re...Nicely done sir! And one hopes it actually gets read!Old NFOhttps://www.blogger.com/profile/16404197287935017147noreply@blogger.com