Need .401 Wsl Load Data

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.

Does anybody have the dimensions (diameter and length) of the original 200- and 250-grain factory bullets for this round? I'm trying to find out what weight bullets the French used in their M1910's in WWI.

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Originally Posted by 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.

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Kudos to Andy for the instructions. Easy process. Loaded with 23g H4227 and a 200gr FMJ. Works like a champ.

Starline Brass has Grendel basic brass available at $180/250 cases. It is a very easy conversion to .401WSL from that brass, lube them well and run through a .41 mag sizer die then trim them about 0.050". These cases are not annealed and have small rifle primer pockets, I have had no issues using this brass.

OP is 9 years old.
Graf's lists Bertram .401 SL brass at $44.99 per 20.