Need .401 Wsl Load Data

[Andy]

A much better choice for brass is Starline 414 Super Mag. Simply reduce the rim diameter, deepen the extractor groove and trim to length. Downside is that Starline only sells them in lots of 250 or more for about $0.50 ea. You need to weigh cheap and good enough, against more expensive and perfect.

As for loads, I have found H4227 to be the pefect powder, using essentially a full case for all bullets weighing up to about the 220grs (I use a 210gr cast sized to 0.408"). With H4227, you get max MV and reliable cycling of the action. I tried faster powders like Unique and Blue Dot, and discovered a strange phenomenom: too little powder and the action will not cycle; too much, and the same thing happens. I believe that with the faster powder, using too little creates too little gas and pressure, while too much, causes the pressure curve to expand the brass against the chamber walls a bit too early. In between and it's just right. I stick with H4227.

You can use 41 Mag dies.