Milsurplus "fun"

[Tailgunner]

I was given this round at SLICS as a curiosity. If anyone ever needed a reason NOT to use an impact bullet puller on an 7.65x53mm Argentine Observation Type R round this should be it. Luckily the powder charge did not ignite and is still contained in the case.
The sharp, pointed firing pin protruding from the brass capsule apparently is what you hear rattling when you shake a live round. This one still rattles (It is loose in the capsule and can travel fore and aft) .

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Phil

In the past I've warned about tearing down military ammo, without knowing exactly what it is your taking apart. The above post/photos are part of the reason. The pin you can see in the bottom left photo is a free floating detonator, that when the inertia puller stopped, kept going and did what it was designed to do.

[mbradst]

What is the use of that type of round? I would think it would detonate while firing the round if it would detonate while using an inertia puller. What say you, TG?

[JLarsson]

Pin at the front - Detonates on impact - Firing would push the "striker" to the rear.

[mbradst]

Thanks. What about dropping it?

[Tailgunner]

That one is called a "observation" round, IE to observe where the bullet hit. In that one, and the German 'B-Patrone" the pin was at the rear and whold be forced to the rear on firing. Upon impact it would slam forward into the detonator.
Below is an experamental British incindary round (they were trying to get away from their older phosphorous loaded incendary), the ball is to increase sensitivy and the incendary compound is retained by the screw. From the outside it looks like a normal ball round.
http://cartridgecollectors.org/cmo/cmo07febb.jpg

The Japanese 7.7mm explosive round, as well as the fairly common US 50 BAT (12.7 x 77 Spotter/Tracer) are reputed to be sensitive enough that dropping is NOT recogmended. While the 50 BAT is easy to identify (note the open nose) the Japenese one looks like a normal ball round EXCEPT for the flat point on the bullet.
http://cartridgecollectors.org/cmo/cmo08dec.jpg
Cutaway of the 50 BAT, tracer compound at the back, explosive "spotter" compound at the front.

[Glooooock]

I like the primer snorkel , is that for better ignition or light tracers more consistently .

[Tailgunner]

It's to start the powder burning closer to center of mass. You will find the same cartridge built both with and without the ign tube.