myzeneye Posted September 20, 2008 Report Share Posted September 20, 2008 my mates just got a rimmy and we were talking about the rounds.... now, please excuse my stupidity, this may be a daft question to some of you, but if i dont ask, ill never know... i understand that with a centrefire or shotgun cart, there is a primer which is struck by a fireing pin.... but with a rimmy, just the edge of the round is stuck, hense the name...(doh!) but what is inside that rim to make the round fire... is it a mix of volatile powders which ignite upon friction ? the only thing i could come up with was the similarity in a rimfire round and them snap bangers my son gets to thow on the floor !!! please ,put me out of my misery and tell me what goes on inside a rimfire round... sorry to ask such a question... Quote Link to comment Share on other sites More sharing options...
codling99 Posted September 20, 2008 Report Share Posted September 20, 2008 http://www.cci-ammunition.com/education/ri..._evolution.aspx might help Quote Link to comment Share on other sites More sharing options...
lambhat Posted September 20, 2008 Report Share Posted September 20, 2008 The main effect is that the primer is detonated by shock, not friction. Like you say, it's the same principle as those things kids throw on the ground. The shock-sensitive component is normally lead styphnate. Try this: http://www.ojp.usdoj.gov/nij/training/fire...fir_m05_t07.htm Quote Link to comment Share on other sites More sharing options...
dazza Posted September 20, 2008 Report Share Posted September 20, 2008 http://en.wikipedia.org/wiki/Rimfire Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted September 20, 2008 Report Share Posted September 20, 2008 (edited) The RIM of the rimfire round is a void into which a percussion-sensitive (initiating) explosive compound is introduced. The striker, or firing-pin of the rifle, sharply 'squeezes' the rim metal together against the chamber mouth, thus initiating the compound. It is somewhat similar to striking a match on a matchbox. The resulting reaction ignites the main propelling charge. Edit: Just read the Wikipedia post above. Disagree with the bit about reloading! It can be done! Did it 40 years ago! Dangerous 'tho, not to be recommended if you don't know what you're playing with! But rimfire ammo is so cheap it ain't worth the bother! Edited September 20, 2008 by Floating Chamber Quote Link to comment Share on other sites More sharing options...
Axe Posted September 22, 2008 Report Share Posted September 22, 2008 Edit: Just read the Wikipedia post above. Disagree with the bit about reloading! It can be done! Did it 40 years ago! Dangerous 'tho, not to be recommended if you don't know what you're playing with! But rimfire ammo is so cheap it ain't worth the bother! Out of curiosity, are you saying you used to reload the spent cartridge cases or did you load brand new cases ? Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted September 22, 2008 Report Share Posted September 22, 2008 (edited) Edit: Just read the Wikipedia post above. Disagree with the bit about reloading! It can be done! Did it 40 years ago! Dangerous 'tho, not to be recommended if you don't know what you're playing with! But rimfire ammo is so cheap it ain't worth the bother! Out of curiosity, are you saying you used to reload the spent cartridge cases or did you load brand new cases ? It was getting on for 50 years actually; I was a kid and used to tinker with 'amorces' of different types. Having dismantled a .22 and scorching and 'silvering' my fingers by prying too clumsily with a pin, (won't go into this for H&E reasons!) I saw that the mysterious compound seemed to have been 'spun' into the void. So I did the same with a dubious dampened compound retrieved from a larger piece of ordnance! 'Nuff said! Only did a few 'reloads' using spent fairground cases and no bullet, because I was only interested in the 'bang'! Edited September 22, 2008 by Floating Chamber Quote Link to comment Share on other sites More sharing options...
Newsportshooter Posted November 10, 2008 Report Share Posted November 10, 2008 'NUTTER' The things we do as kids. I remeber taking a 12G cartridge (one I found in a clay shoot 'empties' bin) to bits setting light to the propellent and then putting the base 'primer and all' under a brick before dropping a concrete slab on said arrangement. Result:- tempoarary deafness - well I was only 12 and I did it in an alleyway between to houses 'LOUD BANG' followed by ringing in the ears is all I remember Quote Link to comment Share on other sites More sharing options...
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