MadMat Posted June 3, 2016 Share Posted June 3, 2016 (edited) I recently looked at a chart on skylighters website that listed dimensions for spollettes. According to this chart a spollette for a 3" shell should have an I.D. of 5/16" and an O.D. of .55". That sounded kind of large for me. My thinking on the matter is that a 5/16 hole would defeat the containment for the burst charge. For the 3" shells I have made so far, the I.D. of my spollettes was 3/16". I did this simply because I had the tooling on hand to make the tube and ram the powder for that particular size. I haven't had any problems with this size, so far, but haven't made that many shells as of yet. Is there a particular reason for making the I.D. of a spollette that large that I am just not seeing? Edited June 3, 2016 by MadMat Link to comment Share on other sites More sharing options...
lloyd Posted June 3, 2016 Share Posted June 3, 2016 (edited) What Harry quoted is about right, Mad.Lloyd Edited June 3, 2016 by lloyd Link to comment Share on other sites More sharing options...
memo Posted June 3, 2016 Share Posted June 3, 2016 i have been using 3/8 id 1/2 od hand rolled 70 lb kraft , works well for me memo Link to comment Share on other sites More sharing options...
Mike Posted June 3, 2016 Share Posted June 3, 2016 I always used 6mm i.d. 10 mm od on that size w/o problems. Link to comment Share on other sites More sharing options...
Carbon796 Posted June 5, 2016 Share Posted June 5, 2016 There will not be any containment issues with a 5/16" ID spolette. That size is traditionally used all the way down to 1-3/4" inserts. A 5/16" x 1/2" spolette will probably have an edge in reliability. It will also deliver a larger burst of fire to the shell. Link to comment Share on other sites More sharing options...
Wiley Posted June 5, 2016 Share Posted June 5, 2016 I hand-roll 1/4" ID X 3/8" OD tubes from ~70# contractor's paper and watered-down Elmer's. They work great, and all my shells are 1.75" nominal. They've been in everything from single breaks up to 6 break-and-reports like these. Link to comment Share on other sites More sharing options...
Zumber Posted June 5, 2016 Share Posted June 5, 2016 OMG..!! 1 Link to comment Share on other sites More sharing options...
Mixer Posted June 5, 2016 Share Posted June 5, 2016 (edited) 3/16"ID here too. I`ve been using these for well over 40 years with no problems. Edited June 5, 2016 by Mixer Link to comment Share on other sites More sharing options...
OldMarine Posted June 5, 2016 Share Posted June 5, 2016 I lucked up and acquired a case of 3" wide register receipt paper and have settled on rolling this 1/4"x3/8" tubes for use as passfires and spollettes. I may need to roll larger passfire tubes later as I move to cylinders larger than 3" but these should suffice for now. Link to comment Share on other sites More sharing options...
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