When the firing pin struck the primer cup
, the explosive was crushed between the cup and anvil, and it ignited.
As pressure increases the edges of the primer cup
flatten and extend further into the primer pocket of the case.
Winchester recently added the Ranger "T" series that features a modified SXT bullet, brass primer cup
and is loaded to deliver consistent ballistics regardless of barrel length.
The Benet-primed cases don't have a "balloon head," since in such cases the primer cup
rises like a prairie dog mound from inside the head of the case (why balloon-head cases have more internal capacity than solid-head cases).
Tenders are invited for Design,Development And Manufacturing Of Tool Block Assembly For Primer Cup
On Linde Press Ofa No.
This sort of perforation takes the form of a hole in the primer cup
the size of the firing pin tunnel where the cup material is simply pushed into the firing pin tunnel by the pressure.
Sometimes the pressure is enough to push the primer cup
and anvil from the primer pocket.
Primer brisance mostly depends on the length of the flame that leaps out of the flash-hole after the firing pin whacks the primer cup
308 WCF case--the only change necessary was the large primer cup
to the small primer cup
on the automatic primer feed.
If you're really unlucky and somehow it does ignite the cartridge, the much thinner primer cup
could rupture and send hot gas and particles flowing back through the action into your face.
The ball of primer dough is then measured out volumetrically into each individual primer explosive pellet, placed in the primer cup
and finally the anvil is inserted.
That led me to wonder if the firing pin is rebounding normally at first, then bouncing back into the primer cup
as the barrel is dropping (except the degree of indentation is very consistent suggesting perfect shot-to-shot and load-to-load timing).