PogueMahone 0 Posted April 6, 2006 Report Share Posted April 6, 2006 doesn't some manufacturer make RIMLESS 12 ga ammo??? wouldn't this solve ALL the problems with autoloading shotguns??? and wouldn't rimless ammo still work in pump and other types of shotguns with some minor mods? Quote Link to post Share on other sites
TonyRumore 1,332 Posted April 6, 2006 Report Share Posted April 6, 2006 Because you can't maintain headspace on a rimless shotgun shell. Quote Link to post Share on other sites
pedal2alloy 206 Posted April 6, 2006 Report Share Posted April 6, 2006 If that is because the OA length of the case varies too much in regular 12ga ammo, it could be standardized to one length. If you were going thru the trouble of standardizing a new rimless cartridge, you could just as easliy standardize the OAL too, I'm thinking. Quote Link to post Share on other sites
TonyRumore 1,332 Posted April 6, 2006 Report Share Posted April 6, 2006 The shell must be held firmly against the bolt face for a gun to work. It doesn't matter how you do it, but if the firing pin drives the entire shell down the bore, you're going to have a problem. Quote Link to post Share on other sites
IndyArms 10,186 Posted April 7, 2006 Report Share Posted April 7, 2006 Thats why shells either have RIMS or SHOULDERS... to have something for the shell to be pressed against inside the chamber to STOP forward movement... If you want to remove the rim... you need a shoulder..... try to put a shoulder on a 12 guage shell... Well.. I dont think anything more needs to be said on THAT topic... Quote Link to post Share on other sites
beerslurpy 1 Posted April 7, 2006 Report Share Posted April 7, 2006 You need to headpsace off something. Obviously shotguns can't headspace off the shoulder because there is no such thing as a bottlenecked shotgun cartridge. On cylindrical handgun shells, you can headspace off the mouth of the case. Shotgun shells, while cylindrical, are all of different lengths and few are made of anything as sturdy as brass. It wouldnt take a lot for an underlength shell to get stuffed beyond the reach of the extractor or for an overlength one to get stuck in the chamber. Which leaves the two remaining choices of headspacing off a belt or a rim. A lot of early magnums headspaced off belts at the back of the cartridge. It was eventually phased out but it did work. 7mm rem mag is an example of this. However, it wouldnt work in other shotguns that expect a rim instead of a belt. No reason to reinvent the wheel when there are already auto shotguns that work fine with rimmed cartridges. Quote Link to post Share on other sites
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