sitsinhedges Posted January 30, 2012 Report Share Posted January 30, 2012 I was roost shooting with my latest batch of 20gauge reloads, 65mm Traditional Game cases refilled with 28grams of shot over a plastic obturator and 12mm fibre with crimp finish, and noticed a couple of cases thrown out by my auto had lumps torn off. Never usually happens so wondered why it should have done this time. I normally roll them but these took pretty good crimps when I made them. Any ideas? Quote Link to comment Share on other sites More sharing options...
southeastpete Posted January 30, 2012 Report Share Posted January 30, 2012 how many times had the cases been reused? Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted January 30, 2012 Author Report Share Posted January 30, 2012 how many times had the cases been reused? Once Quote Link to comment Share on other sites More sharing options...
Underdog Posted January 30, 2012 Report Share Posted January 30, 2012 That looks like a delayed ignition to me! The primer only partialy ignites the powder compresses the wadding and then stops and then "kicks" in again causing a cavitated load situation. The progressive opening of the crimp is lost. The resulting explosion is to sudden for the crimp to open and rips the plastic from the rest of the case. A mag primer may be needed. A roll crimp may put more compression on the load and help it to start combustion better as may a deeper star crimp. That my intial thoughts any way! Underdog. Quote Link to comment Share on other sites More sharing options...
nabbers Posted January 30, 2012 Report Share Posted January 30, 2012 I've rejected a few that have shown a bulge at that point, like the wad went in at angle. It almost looks like the plastic tumbled out of there! I've also noticed that some manufacturers used cases (winchester for one) seem to be messy after firing round the crimp area, with slits and thinness, wondered if they are designed to not be suitable for reloading. Quote Link to comment Share on other sites More sharing options...
Beretta28g Posted January 30, 2012 Report Share Posted January 30, 2012 Exposure to sunlight making the case brittle? Quote Link to comment Share on other sites More sharing options...
Catweazle Posted January 30, 2012 Report Share Posted January 30, 2012 Could the carts have been exceptionally cold, making them brittle ? I have only seen similar damage once, from an old semi-auto that had serious pitting around the chamber, not that it will be the case here. The cases were getting blown into the pits and as the case extracted the case was getting ripped up. Quote Link to comment Share on other sites More sharing options...
Underdog Posted January 30, 2012 Report Share Posted January 30, 2012 I've rejected a few that have shown a bulge at that point, like the wad went in at angle. It almost looks like the plastic tumbled out of there! I've also noticed that some manufacturers used cases (winchester for one) seem to be messy after firing round the crimp area, with slits and thinness, wondered if they are designed to not be suitable for reloading. The quality of cases for reloading is bad nowadays yes! It use to be easy to find decent cases, not any more! U. Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted January 31, 2012 Report Share Posted January 31, 2012 thats a new one to me! Quote Link to comment Share on other sites More sharing options...
M.I.A Posted January 31, 2012 Report Share Posted January 31, 2012 As above, never seen that before! Quote Link to comment Share on other sites More sharing options...
BlaserF3 Posted January 31, 2012 Report Share Posted January 31, 2012 When I first started shooting years ago Sellior Belliot were a very popular cartridge to use and the same thing happened quite often. I have no idea why though. Quote Link to comment Share on other sites More sharing options...
dk6052 Posted January 31, 2012 Report Share Posted January 31, 2012 I've part of a crimp detach itself on an Eley Olympic (not reloaded). I put it down to brittle plastic. Quote Link to comment Share on other sites More sharing options...
David BASC Posted January 31, 2012 Report Share Posted January 31, 2012 I remember early Eley Bismuth cartridges would do this from time to time but was soon 'corrected' when they got a new batch of plastic in. I guess tiny cracks could have been in the case from the fist firing that were not visible to the naked eye and they simply gave way under the 2nd firing? It’s not unusual for this to happen in materials that are under high stress as far as I remember from physics module on the properties of materials. (30 years ago!) David Quote Link to comment Share on other sites More sharing options...
Mick Shaw Posted January 31, 2012 Report Share Posted January 31, 2012 I've had a few do this, more 28 gauge than 20 gauge, but they were all well used cases. Mick. Quote Link to comment Share on other sites More sharing options...
hyflier Posted February 1, 2012 Report Share Posted February 1, 2012 I had a batch of .410 do this, they were subsequently returned as faulty which was accepted by the manufacturer, but no explanation was given. Quote Link to comment Share on other sites More sharing options...
Pigeon_snIPer Posted February 1, 2012 Report Share Posted February 1, 2012 I've had a couple of these - it is quite possible that the plastic case has lost its strength and so was ripped. /S/ Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted February 1, 2012 Report Share Posted February 1, 2012 Could be pressure, usually accompanied by a 'flattened' primer against the breech face. However, HEAT from a 'slow' burn before the crimp bursts, can melt and cause the now weakened case to be torn apart. I have seen this 28gauge and 3" .410 in the past. Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted February 1, 2012 Report Share Posted February 1, 2012 has this happend to the shells you make with new cases? can you tell us the recipe you use with them? plaswad or fibre? go-on give us a clue? it does look like a firing issue, not a mechanical ejection problem. Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted February 1, 2012 Report Share Posted February 1, 2012 (edited) has this happend to the shells you make with new cases? can you tell us the recipe you use with them? plaswad or fibre? go-on give us a clue? it does look like a firing issue, not a mechanical ejection problem. I've never had it happen. Just seen shells like it on the clay ground. It's Sit's post! (The info you need is in his post) Edited February 1, 2012 by Floating Chamber Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted February 1, 2012 Author Report Share Posted February 1, 2012 has this happend to the shells you make with new cases? can you tell us the recipe you use with them? plaswad or fibre? go-on give us a clue? it does look like a firing issue, not a mechanical ejection problem. It was a fibre recipe and 3 grains of powder under the Nobelsport nominal max. Over pressure should never have been an issue. I don't make shells with new cases, what would be the point Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted February 1, 2012 Report Share Posted February 1, 2012 The point would have been, if the same happens to your new cases as the used ones, then it is the recipe. if it happened to the once fired hulls, only then it would be the hulls. what was the pressure of the previous shell? The noblesports data is usually hot but, if you say you loaded fibre and 3 grains under? what was the powder? was it A)0 or slower burning? Quote Link to comment Share on other sites More sharing options...
mr salt Posted February 1, 2012 Report Share Posted February 1, 2012 if you need any once fired empty 20bore cartridge cases let me know . just pay the post at cost. Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted February 1, 2012 Author Report Share Posted February 1, 2012 if you need any once fired empty 20bore cartridge cases let me know . just pay the post at cost. I just might What brand do you use Quote Link to comment Share on other sites More sharing options...
mr salt Posted February 1, 2012 Report Share Posted February 1, 2012 mixed gamebore /express/ and a few eley vip.(deeper brass) will be getting rc next time. Also have 16 bore and 12 bore if you want them . shame to bin them if someome wants them. Quote Link to comment Share on other sites More sharing options...
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