This loading was devised by Alex and it was tested with a pressure gauge.
It is very interesting. It is a loding lower than a classic .410 infact in this test You can see 14 grams of shot but in a normal .410 You can find 17-21 grams of shot.
In this loading we have used lead shot (size n°12 Italian).
The powder is the SP3 which has done a optimal pressure and velocity as You can see in the document.
We have used a minicontainer h27.
A very interesting loading, very fast (400 m/s) with low pressure (728 bar)
NOTE:
DETAILS: (*) Chilled shot has a good ballistic efficiency because it reduces the deformations.
We have made a round edge clousure
It is great as You can see.
Its finished height is 60,5mm.