The nosecap was made thinner to gaine sensibility and the tracer pocket was made bigger for better ignition. The thinned out cap works well, but was difficult to produce. Even a primer cap in the nose was tested, without low effect. So a plastic nosecap was used, made from Trolitul, the impact ignite the incendiary composit - the caphole was lathed out to give an sharp edge for better punch the target media and a waffle pattern was pressed into the primer compound to rise surface and therefor an better ignition of the tracer.
The bullet was still too light and the tracer problem wasnt solved 100 %.
So a lead cylinder was set into the bullet to reach a weight of 10 gramms and a prepressed tracer capsule was used. This was, after 40 different bullet patterns, the final version of the APINCT projectile. Interesting that this projectile where designated as incendiary shells ( Brandgranate ) - and not bullets. May be because of the driving band. 100000 bullets where made in November 1943.
Several more tests with a totally different design using a jacket with pressed in - or better pressed out driving band, a steel tube and tracer capsule, limping the introduction of the bullets into mid 1944. These jacketed version was not successful, low performance, difficult to produce and there was a shortage of drawn jackets.
Then all developement and a introduction was ceased. The war overroll the project. Aircraft guns of 13mm, 20mm and 30mm where standard- no chance for the 7,92mm caliber. This is a little bit long winded, but very interesting to see an evolution and developement of a bullet type. At the end with a successful new bullet design, but outdated by weapon, aircraft, armour and protection designs.