This loading was devised by Alex and it was tested with a pressure gauge.
it is a strong loading as we can usually see in godd .410 loading.
The powder is the excellent IMR4227, It gives low pressure (850 bar) and hight velocity (385 m/s).
The wad is a traditional one with couvette.
It is a great cartridge over 20 m.
We have chose a traditional wad 6mm coeck + 6mm felt and we have added a couvette as You can see.
Actually it is very difficult to find a couvette in .410GA so we have made it with an alf of MiniBior Gualandi
We have made a round clousure
It is great as You can see.
Its finished height is 72,3mm.