Japanese 7.7x56R incendiary pattern 2

This sole incendiary round, originally for MG use, was hiding in a bag of other Japanese ammo, tolerating all turns and tumbles. It has a reputation for being very sensitive but made for harsh and jerky machine gun environment. So how sensitive is it really?
Was there a QC test for them, like the drop test for German B-Patrone?

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If it has a purple primer seal, it is actually HE-I.
The compound was originally RDX, then Picric Acid in a double Jacket.
See Elks.
Doc AV

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Maybe I misunderstood Elks book. It says on p.71 in table XII that pattern 1 is “knurled cannelure visible at case mouth” (like one below) and pattern 2 is “flat-tipped”.
Chemically picric acid ages and becomes unstable. Was picric acid in both patterns?


The info I have is this the only really dangerous round from the Japanese
lot is the Explosive,and that one has a flat tip and a purple band around
the bullet and case mouth the purple appears almost black and is darker
than on the incendiary loadings the top of the bullet is flat by about 1/10
and can go off by impact only.The bullet charge consist of RDX and PETN
very nasty stuff.Vladimir I collect them when I can find them however I had
never been able to encounter one of those a long time I heard during the
60ties some people had some but destroyed them because of the danger.
a good give away is the cut off tip if original

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I think colcartinc still has some of the flat tipped rounds for sale.