tlingitndn Posted October 8, 2008 Share Posted October 8, 2008 I was cleaning my Super Nova yesterday and noticed that that there is some ribbing about 4-6 inches from the chamber. I thought it was really dirty, I had shot over 100 rounds earlier that day. Needless to say the barrel is really clean now. But I looked in my buddies Reminton 870 and it has the ribbing also. Neither of usknow what it is or its function. Anyone know? Quote Link to comment Share on other sites More sharing options...
timb99 Posted October 8, 2008 Share Posted October 8, 2008 Not sure what you mean by "ribbing." Can you describe it? A typical shotgun barrel chamber diameter is close to the same as the outside diameter of a shell. Then, at the end of the chamber there is a tapered "forcing cone." This is where the barrel tapers from the chamber diameter to the bore diameter. A typical 12 gauge bore diameter is approximately 0.729 (though that varies slightly from manufacturer to manufacturer, and may be bigger if your barrel is "back bored.") The bore stays relatively constant from the end of the forcing cone until you get to the choke. Then the barrel diameter tapers down to the choke diameter at the muzzle end. The barrel should be pretty smooth. from end to end. That is, no ribbing. Quote Link to comment Share on other sites More sharing options...
tucker301 Posted October 9, 2008 Share Posted October 9, 2008 Wadding stripes. Quote Link to comment Share on other sites More sharing options...
splashtx556ftw Posted October 9, 2008 Share Posted October 9, 2008 i think what your seeing is a refection of the end of the barrel. i looked down the chamber end of my charles daly & franchi, and i believe thats what your seeing. if you wooble the barrel a little, youll see those "ribs" moving. Quote Link to comment Share on other sites More sharing options...
splashtx556ftw Posted October 12, 2008 Share Posted October 12, 2008 thats my point. kinda like looking through a kalidascope. Quote Link to comment Share on other sites More sharing options...
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