The Mighty Prawn Posted June 18, 2015 Report Share Posted June 18, 2015 http://www.nra.org.uk/common/asp/content/content.asp?site=NRA&id=1670 This link contains a link to a report of an incident involving catastrophic failure of a rifle for reason/reasons not fully understood but likely to be a combination of a sub standard rebarrel, malformed ammo and under loaded powder Scary thing is I've never heard of under loaded ammo being able to generate excess pressure, also scary is nobody knows why this happens having seen the photo of his unfired ammo I think he was always destined for an incident as that one case picture on the gauge is all kind of deformed and I can't see how anyone would want to load that Quote Link to comment Share on other sites More sharing options...
Guest stevo Posted June 18, 2015 Report Share Posted June 18, 2015 http://www.nra.org.uk/common/asp/content/content.asp?site=NRA&id=1670 This link contains a link to a report of an incident involving catastrophic failure of a rifle for reason/reasons not fully understood but likely to be a combination of a sub standard rebarrel, malformed ammo and under loaded powder Scary thing is I've never heard of under loaded ammo being able to generate excess pressure, also scary is nobody knows why this happens having seen the photo of his unfired ammo I think he was always destined for an incident as that one case picture on the gauge is all kind of deformed and I can't see how anyone would want to load that This is why you have to be soooo carefull when trying to make sub sonic CF rounds . Get a " flash over " or resulting in case detonation . Quote Link to comment Share on other sites More sharing options...
phaedra1106 Posted June 18, 2015 Report Share Posted June 18, 2015 (edited) Sub Sonic CF rounds are perfectly safe if you use the correct powders, even Hodgdon list sub-sonic loads in their reloading data. Given the amount of powder estimated to have been in the cases (aprox: 34gr) this would have produced velocities of around 2600fps. The cause of "flash over" or Secondary Explosion Effect have yet to be reliably replicated in a test situation, however, the most widely accepted cause is thought to be a very small (15% or so) of slow burning rifle powder in a large case. There's another thread running in which I've given a copy of the article by Ed Harris regarding the use of cast boolits in military calibre rifles. http://forums.pigeonwatch.co.uk/forums/topic/314274-the-cost-of-reloading-my-243/page-2 In the case above it appears to be a case of very badly assembled ammunition being used in a rifle which may/may not have also had problems having been poorly re-barreled. Lovex do not list D073 (in any variant) for use in the 6.5x55, D073.x would be too fast for the cartridge, S070 would be a better choice. Accurate list several 2520 loads for 6.5 Grendel and 6.5x47 all starting in the high 20gr to low 30gr range but again nothing for its use in 6.5x55 Edited June 18, 2015 by phaedra1106 Quote Link to comment Share on other sites More sharing options...
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